Green,M. et al.
Journal of the Chemical Society, Dalton Transactions: Inorganic Chemistry (1972-1999), 1977 , p. 1519 - 1525

Kolesnikov, S. P.; Li, V. Ya.; Nefedov, O. M.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1985 , vol. 34, p. 1267 - 1271
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1985 , p. 1386 - 1391