Pemex Claims Ownership of Lion's Share of Zama Field - Natural Gas Intelligence
U.S. oil service group seeks $100 million from Mexico in arbitration claim | Reuters
DEA to acquire Sierra Oil & Gas in Mexico, including stake in world class Zama discovery - Drilling Contractor
Sierra Oil & Gas reveals Mexico drilling plans - BNamericas
Williams lands Gulf of Mexico pipeline deal with Chevron, Total
Sierra Oil and Gas a WintershallDEA company | LinkedIn
DEA to acquire Sierra Oil & Gas in Mexico – Energy Northern Perspective
Mexico: DEA to acquire Sierra Oil & Gas - including stake in world class Zama discovery
Quién es Sierra Oil & Gas?
Lawsuit challenges Biden plan to sell oil and gas leases in Gulf of Mexico | Oil | The Guardian
Investors Find Major Oil Deposit in Gulf of Mexico - WSJ
DEA Deutsche Erdoel completes Sierra Oil & Gas acquisition
Sierra Oil and Gas, S. de R.L. de C.V. (Sierra) - BNamericas
Mexico-Major Non-OPEC Oil Producer
Sierra Oil and Gas by Oil Business México
Storm Knocks Out U.S. Gulf of Mexico Natural Gas Pipeline | Pipeline and Gas Journal
NET Mexico Pipeline Project, Texas - Hydrocarbons Technology
Sierra Oil and Gas by Oil Business México
DEA Deutsche Erdoel completes Sierra Oil & Gas acquisition
The exceptional career of Ivan Sandrea, chief executive officer at Sierra Oil & Gas - WU Executive Academy
Mexico Ventures Into Oil Field Investments | Inside Energy
DEA to acquire Sierra Oil & Gas in Mexico, including stake in world class Zama discovery - Drilling Contractor
Mexico, an Oil Producer, Hasn't Benefited From Soaring Prices - The New York Times
Who will drill Mexico's hottest oil prospect? – The Yucatan Times
12 of 14 Blocks Go Unsold in Mexico's First Oil & Gas Auction - Oil & Gas 360
