Haddad, M.; Legros, J. P.; Lopez, L.; Boisdon, M. T.; Barrans, J.
Phosphorus, Sulfur and Silicon and the Related Elements, 1992 , vol. 69, # 12 p. 189 - 196

Pinson, V. V.; Khrustalev, V. A.; Zelenin, K. N.; Matveeva, Z. M.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1984 , vol. 20, # 10 p. 1170 - 1176
Khimiya Geterotsiklicheskikh Soedinenii, 1984 , vol. 20, # 10 p. 1415 - 1421

Haddad, M.; Legros, J. P.; Lopez, L.; Boisdon, M. T.; Barrans, J.
Phosphorus, Sulfur and Silicon and the Related Elements, 1992 , vol. 69, # 12 p. 189 - 196