Frisch K. C., Hernandez, . (1977). International progress in urethanes. V 1. Westport: Technomic.
Frisch K C, Hernandez, . 1977. International progress in urethanes. V 1. Westport: Technomic.
Frisch K C, Hernandez, . International progress in urethanes. V 1. Westport: Technomic. 1977.