Shuikin,N.I. et al.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1961 , p. 1010 - 1013
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1961 , # 6 p. 1094 - 1098
Armstrong, Susan K.; Collington, Eric W.; Knight, Julian G.; Naylor, Alan; Warren, Stuart
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1993 , # 13 p. 1433 - 1448