APA

Blomberg T. A., World Petroleum Congress (13th. : 1991 : Buenos Aires), .Manufacture of industrial bitumens of low breaking point from paraffin base crude oil. : .

Chicago

Blomberg Timo A, World Petroleum Congress (13th. : 1991 : Buenos Aires), .Manufacture of industrial bitumens of low breaking point from paraffin base crude oil. : .

Harvard

Blomberg T. A., World Petroleum Congress (13th. : 1991 : Buenos Aires), .Manufacture of industrial bitumens of low breaking point from paraffin base crude oil. : .

MLA

Blomberg Timo A, World Petroleum Congress (13th. : 1991 : Buenos Aires), .: . .