Prabhakaran, P V; S, Jayadev; Nema, S K; Rao, K V C
Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, 1991 , vol. 30, # 11 p. 1072 - 1073

Xiao, Zili; Yang, Michael G.; Tebben, Andrew J.; Galella, Michael A.; Weinstein, David S.
Tetrahedron Letters, 2010 , vol. 51, # 44 p. 5843 - 5844

Hegarty,A.F. et al.
Journal of the Chemical Society, Perkin Transactions 2: Physical Organic Chemistry (1972-1999), 1973 , p. 2054 - 2060

Griess
Chemische Berichte, 1875 , vol. 8, p. 222