Khorlina,M.Ya. et al.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1972 , vol. 21, p. 1951 - 1954
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1972 , vol. 21, # 9 p. 2009 - 2013