Cullen, Edward R.; Guziec, Frank S.
Journal of Organic Chemistry, 1986 , vol. 51, # 8 p. 1212 - 1216

Krebs, Adolf; Kaletta, Bernd; Nickel, Wolf-Ulrich; Rueger, Wolfgang; Tikwe, Liane
Tetrahedron, 1986 , vol. 42, # 6 p. 1693 - 1702