Arbuzov,B.A. et al.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1969 , p. 2549 - 2551
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1969 , # 12 p. 2712 - 2715

Rhone-Poulenc Sante
Patent: US4960904 A1, 1990 ;

Lloyd,E.J.; Porter,Q.N.
Australian Journal of Chemistry, 1977 , vol. 30, p. 569 - 578