EXHIBIT A JOINT FILING UNDERTAKINGJoint Filing • October 24th, 2013 • Steelhead Partners LLC • Crude petroleum & natural gas
Contract Type FiledOctober 24th, 2013 Company IndustryThe undersigned, being authorized thereunto, hereby execute this agreement as an exhibit to this Schedule 13G to evidence the agreement of the below-named parties, in accordance with rules promulgated pursuant to the Securities Exchange Act of 1934, to file this Schedule, as it may be amended, jointly on behalf of each of such parties.