JOINT FILING UNDERTAKINGJoint Filing Undertaking • April 2nd, 2013 • Steelhead Partners LLC • Crude petroleum & natural gas
The undersigned, being authorized thereunto, hereby execute this agreement to evidence the agreement of the below-named parties, in accordance with rules promulgated pursuant to the Securities Exchange Act of 1934, to make filings required under Section 13, as they may be amended, jointly on behalf of each of such parties.
