| chk-20110331.xml | EX-101.INS - XBRL INSTANCE DOCUMENT |
| chk-20110331.xsd | EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA |
| chk-20110331_cal.xml | EX-101.CAL - XBRL TAXONOMY EXTENSION CALCULATION LINKBASE |
| chk-20110331_def.xml | EX-101.DEF - XBRL TAXONOMY EXTENSION DEFINITION LINKBASE |
| chk-20110331_lab.xml | EX-101.LAB - XBRL TAXONOMY EXTENSION LABEL LINKBASE |
| chk-20110331_pre.xml | EX-101.PRE - XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE |