Elguero, Jose; Ochoa, Carmen; Stud, Manfred; Esteban-Calderon, Carmen; Martinez-Ripoll, Martin; et al.
Journal of Organic Chemistry, 1982 , vol. 47, # 3 p. 536 - 544

Gediz Erturk, Aliye; Bekdemir, Yunus
Phosphorus, Sulfur and Silicon and the Related Elements, 2014 , vol. 189, # 2 p. 285 - 292