Makarov, Alexander Yu.; Blockhuys, Frank; Bagryanskaya, Irina Yu.; Gatilov, Yuri V.; Shakirov, Makhmut M.; Zibarev, Andrey V.
Inorganic Chemistry, 2013 , vol. 52, # 7 p. 3699 - 3710

Efros,L.S. et al.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1976 , vol. 12, p. 1128 - 1131
Khimiya Geterotsiklicheskikh Soedinenii, 1976 , vol. 12, p. 1361 - 1364