de Pascual, Joaquin; San Feliciano, Arturo; del Corral, Jose M. Miguel; Barrero, Alejandro F.; Rubio, Maribel; Muriel, Livio
Phytochemistry (Elsevier), 1981 , vol. 20, # 12 p. 2778 - 2779

Ahluwalia, V. K.; Mukherjee, Irani
Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, 1984 , vol. 23, # 3 p. 272 - 273

Israelstam; Stephen
Journal of the South African Chemical Institute, 1943 , vol. 26, p. 41,45