Namy, J. L.; Souppe, J.; Collin, J.; Kagan, H. B.
Journal of Organic Chemistry, 1984 , vol. 49, # 11 p. 2045 - 2049

Barluenga, Jose; Alonso-Cires, Luisa; Campos, Pedro J.; Asensio, Gregorio
Tetrahedron, 1984 , vol. 40, # 13 p. 2563 - 2568