Padwa, Albert; Chiacchio, Ugo; Fairfax, David J.; Kassir, Jamal J.; Litrico, Angelo; at al.
Journal of Organic Chemistry, 1993 , vol. 58, # 23 p. 6429 - 6437

Bellina, Fabio; Ciucci, Donatella; Vergamini, Piergiorgio; Rossi, Renzo
Tetrahedron, 2000 , vol. 56, # 16 p. 2533 - 2545