Sankyo Company, Limited
Patent: US5470851 A1, 1995 ;
US 5470851 A

Pavlova, L. A.; Davidovich, Yu. A.; Rogozhin, S. V.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1986 , vol. 35, # 1 p. 211 - 212
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1986 , # 1 p. 228 - 229