APA

Grotewold G., Fuhrberg H., Philipp W., World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest), Fuhrberg H. & Philipp W.Production and processing of nitrogen rich natural gases from reservoirs in the ne part of the Federal Republic of Germany. : .

Chicago

Grotewold G, Fuhrberg H.D, Philipp W, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest), Fuhrberg H.D and Philipp W.Production and processing of nitrogen rich natural gases from reservoirs in the ne part of the Federal Republic of Germany. : .

Harvard

Grotewold G., Fuhrberg H., Philipp W., World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest), Fuhrberg H. and Philipp W.Production and processing of nitrogen rich natural gases from reservoirs in the ne part of the Federal Republic of Germany. : .

MLA

Grotewold G, Fuhrberg H.D, Philipp W, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest), Fuhrberg H.D and Philipp W.: . .