If you find this page useful and would like to be notified of changes made to this page, start by inputting your email below.
powered by ChangeDetection
Well ID: 42-105-39527 | Loading map...
{"type":"SATELLITE","minzoom":false,"maxzoom":false,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"mappingservice":"googlemaps3","width":"100%","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"wmsoverlay":false,"copycoords":false,"static":false,"zoom":14,"layers":[],"controls":["pan","zoom","type","scale","streetview","rotate"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"resizable":false,"kmlrezoom":false,"poi":true,"markercluster":false,"clustergridsize":60,"clustermaxzoom":20,"clusterzoomonclick":true,"clusteraveragecenter":true,"clusterminsize":2,"imageoverlays":[],"kml":[],"gkml":[],"searchmarkers":"","enablefullscreen":false,"scrollwheelzoom":false,"locations":[{"text":"","title":"","link":"","lat":30.70451805,"lon":-101.20348995996,"icon":""}]} Map displayed above is an approximation of the well location based on well county. |
County: Crockett | |
District: 7C | |
Well Type: Gas | |
Well Number: 4 | |
Lease Number: 211210 | |
Wellbore Shutin Date: | |
Well Shutin Date: | |
Subject to Rule 14(B)(2): No | |
14(B)(2) Status: Not subject for extension | |
Location: Land |
For data sources see[1]
Year | Month | Oil Volume (BBL) | Gas Volume (MCF) | Condensate Volume (BBL) | Casing Head Gas Volume (MCF) | Lease Name | Operator Name | Field Name |
---|---|---|---|---|---|---|---|---|
2005 | 04 | 0 | 0 | 0 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2005 | 05 | 0 | 3188 | 33 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2005 | 06 | 0 | 12286 | 211 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2005 | 07 | 0 | 12881 | 112 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2005 | 08 | 0 | 8406 | 22 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2005 | 09 | 0 | 8470 | 34 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2005 | 10 | 0 | 7652 | 46 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2005 | 11 | 0 | 5760 | 33 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2005 | 12 | 0 | 5760 | 44 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2006 | 01 | 0 | 5563 | 40 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2006 | 02 | 0 | 4471 | 26 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2006 | 03 | 0 | 4766 | 31 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2006 | 04 | 0 | 4174 | 17 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2006 | 05 | 0 | 3964 | 11 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2006 | 06 | 0 | 3581 | 13 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2006 | 07 | 0 | 3598 | 0 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2006 | 08 | 0 | 2984 | 0 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2006 | 09 | 0 | 3113 | 37 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2006 | 10 | 0 | 2589 | 5 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2006 | 11 | 0 | 2211 | 7 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2006 | 12 | 0 | 2292 | 5 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2007 | 01 | 0 | 2326 | 9 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2007 | 02 | 0 | 1858 | 8 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2007 | 03 | 0 | 1808 | 29 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2007 | 04 | 0 | 1812 | 16 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2007 | 05 | 0 | 1933 | 0 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2007 | 06 | 0 | 2032 | 8 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2007 | 07 | 0 | 2019 | 3 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2007 | 08 | 0 | 1999 | 0 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2007 | 09 | 0 | 1765 | 0 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2007 | 10 | 0 | 1827 | 0 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2007 | 11 | 0 | 1673 | 0 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2007 | 12 | 0 | 1476 | 0 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2008 | 01 | 0 | 1571 | 2 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2008 | 02 | 0 | 1456 | 1 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2008 | 03 | 0 | 1544 | 20 | 0 | SINCLAIR CLAYTON "10" | ENCANA OIL & GAS(USA) INC. | OZONA, NE. (CANYON 7520) |
2008 | 04 | 0 | 927 | 14 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2008 | 05 | 0 | 1262 | 9 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2008 | 06 | 0 | 1389 | 30 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2008 | 07 | 0 | 1454 | 33 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2008 | 08 | 0 | 1064 | 0 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2008 | 09 | 0 | 408 | 0 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2008 | 10 | 0 | 1116 | 0 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2008 | 11 | 0 | 996 | 0 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2008 | 12 | 0 | 979 | 0 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2009 | 01 | 0 | 1221 | 0 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2009 | 02 | 0 | 845 | 0 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2009 | 03 | 0 | 1461 | 0 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2009 | 04 | 0 | 1195 | 0 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2009 | 05 | 0 | 1241 | 7 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2009 | 06 | 0 | 1064 | 14 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2009 | 07 | 0 | 1135 | 9 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2009 | 08 | 0 | 1078 | 5 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2009 | 09 | 0 | 1110 | 168 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2009 | 10 | 0 | 864 | 7 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2009 | 11 | 0 | 942 | 7 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2009 | 12 | 0 | 877 | 8 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2010 | 01 | 0 | 848 | 9 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2010 | 02 | 0 | 798 | 13 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2010 | 03 | 0 | 841 | 6 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2010 | 04 | 0 | 805 | 7 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2010 | 05 | 0 | 841 | 9 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2010 | 06 | 0 | 711 | 4 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2010 | 07 | 0 | 601 | 2 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2010 | 08 | 0 | 804 | 3 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2010 | 09 | 0 | 857 | 3 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2010 | 10 | 0 | 926 | 7 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2010 | 11 | 0 | 874 | 11 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2010 | 12 | 0 | 849 | 0 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2011 | 01 | 0 | 837 | 8 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2011 | 02 | 0 | 726 | 8 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2011 | 03 | 0 | 786 | 7 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2011 | 04 | 0 | 562 | 9 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2011 | 05 | 0 | 890 | 10 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2011 | 06 | 0 | 558 | 6 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2011 | 07 | 0 | 836 | 4 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2011 | 08 | 0 | 1059 | 162 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2011 | 09 | 0 | 769 | 0 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2011 | 10 | 0 | 859 | 8 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2011 | 11 | 0 | 760 | 7 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2011 | 12 | 0 | 662 | 9 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2012 | 01 | 0 | 772 | 3 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2012 | 02 | 0 | 789 | 3 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2012 | 03 | 0 | 765 | 2 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2012 | 04 | 0 | 716 | 5 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2012 | 05 | 0 | 692 | 0 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2012 | 06 | 0 | 615 | 2 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2012 | 07 | 0 | 680 | 7 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2012 | 08 | 0 | 751 | 5 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2012 | 09 | 0 | 659 | 3 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2012 | 10 | 0 | 490 | 0 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2012 | 11 | 0 | 723 | 5 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2012 | 12 | 0 | 557 | 8 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2013 | 01 | 0 | 741 | 5 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2013 | 02 | 0 | 642 | 5 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2013 | 03 | 0 | 458 | 5 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2013 | 04 | 0 | 653 | 6 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2013 | 05 | 0 | 599 | 5 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2013 | 06 | 0 | 735 | 5 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2013 | 07 | 0 | 673 | 3 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2013 | 08 | 0 | 542 | 0 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2013 | 09 | 0 | 608 | 1 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2013 | 10 | 0 | 651 | 2 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2013 | 11 | 0 | 596 | 6 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2013 | 12 | 0 | 551 | 2 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2014 | 01 | 0 | 361 | 5 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2014 | 02 | 0 | 229 | 2 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2014 | 03 | 0 | 292 | 0 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2014 | 04 | 0 | 495 | 2 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2014 | 05 | 0 | 570 | 4 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2014 | 06 | 0 | 228 | 1 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2014 | 07 | 0 | 251 | 0 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2014 | 08 | 0 | 252 | 0 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2014 | 09 | 0 | 265 | 0 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2014 | 10 | 0 | 202 | 0 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2014 | 11 | 0 | 272 | 0 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2014 | 12 | 0 | 0 | 0 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2015 | 01 | 0 | 0 | 0 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
2015 | 02 | 0 | 0 | 0 | 0 | SINCLAIR CLAYTON "10" | SMITH OPERATING AND MGMT CO. | OZONA, NE. (CANYON 7520) |
For data sources see[2]