KHAN, S. M.; GULL, N.; AKRAM, M. Y.; HAIDER, H. A.; AKRAM, M. Y.; IMRAN, M.; BUTT, M. T. Z.; JAMIL, T. A Study on Synthesis and Testing of Polyols Using Soybean Oil and Castor Oil. v. 13, n. 2, p. 27-38, 31 Des 2013.