Acharya, Jyotiranjan; Shakya, Purushottam D.; Pardasani, Deepak; Palit, Meehir; Dubey, Devendra K.; Gupta, Arvind K.
Journal of Chemical Research, 2005 , # 3 p. 194 - 196

Kiddle, James J.; Gurley, Alison F.
Phosphorus, Sulfur and Silicon and Related Elements, 2000 , vol. 160, p. 195 - 205

Pavlov, V. A.; Kurdyukov, A. I.; Gorin, B. I.; Sagitova, F. R.; Aristova, N. V.; et al.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1994 , vol. 30, # 6 p. 718 - 723
Khimiya Geterotsiklicheskikh Soedinenii, 1994 , # 6 p. 821 - 828

de Roos; Toet
Recueil des Travaux Chimiques des Pays-Bas, 1959 , vol. 78, p. 59,61