Wright, Andrew D.; Bowen, Richard D.; Jennings, Keith R.
Journal of the Chemical Society, Perkin Transactions 2: Physical Organic Chemistry (1972-1999), 1989 , p. 1521 - 1528
Nefedov,B.K. et al.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1975 , vol. 24, p. 1673 - 1676
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1975 , vol. 24, p. 1792 - 1796