APA

Paraschiv D., Filipescu M., World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest) & Filipescu M.Variation of non hydrocarbon constituents of natural gas in different romanian areas. : .

Chicago

Paraschiv D, Filipescu M, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest) and Filipescu M.Variation of non hydrocarbon constituents of natural gas in different romanian areas. : .

Harvard

Paraschiv D., Filipescu M., World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest) and Filipescu M.Variation of non hydrocarbon constituents of natural gas in different romanian areas. : .

MLA

Paraschiv D, Filipescu M, World Petroleum Congress (10th : 1979 sept. 9-14 : Bucharest) and Filipescu M.: . .