APA

Schumi W., Gager H., World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro B. & Gager H.Optimisation of oil production in the mature oil field of Matzen. : .

Chicago

Schumi Walter, Gager Herbert, World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro Brasil) and Gager Herbert.Optimisation of oil production in the mature oil field of Matzen. : .

Harvard

Schumi W., Gager H., World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro B. and Gager H.Optimisation of oil production in the mature oil field of Matzen. : .

MLA

Schumi Walter, Gager Herbert, World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro Brasil) and Gager Herbert.: . .