Pirrung, Frank O. H.; Rutjes, Floris P. J. T.; Hiemstra, Henk; Speckamp, W. Nico
Tetrahedron Letters, 1990 , vol. 31, # 37 p. 5365 - 5368

Rutjes; Hiemstra; Pirrung; Speckamp
Tetrahedron, 1993 , vol. 49, # 44 p. 10027 - 10048