Dey; Ramanathan
Proceedings of the National Institute of Sciences of India, 1943 , vol. 9, p. 193,222

Aguirre, J. M .; Alesso, E. N.; Ibanez, A. F.; Tombari, D. G.; Moltrasio Iglesias G. Y.
Journal of Heterocyclic Chemistry, 1989 , vol. 26, p. 25 - 27