Krichevskii; Alekseeva; Anisimova; Parshin; Asnina; Granik
Pharmaceutical Chemistry Journal, 1997 , vol. 31, # 8 p. 399 - 402

Greenhill, John V.; Moten, Ashraf M.
Tetrahedron, 1983 , vol. 39, # 20 p. 3405 - 3408