by Pshenichnyi, G. V., Khoang, Vu Din', Stanishevskii, L. S.
Published in Chemistry of heterocyclic compounds (New York, N.Y. 1965) (01.02.1994)

by Vu, Din' Khoang, Pshenichnyi, G. V., Mashenkov, V. A., Stanishevskii, L. S.
Published in Chemistry of heterocyclic compounds (New York, N.Y. 1965) (01.12.1993)