APA

Yuanyi Y., World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro B., .Optimization and diversification of ethylene feedstock. : .

Chicago

Yuanyi Yang, World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro Brasil), .Optimization and diversification of ethylene feedstock. : .

Harvard

Yuanyi Y., World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro B., .Optimization and diversification of ethylene feedstock. : .

MLA

Yuanyi Yang, World Petroleum Congress (17th. : 2002 sept. 1-5 : Río de Janeiro Brasil), .: . .