Fornasier, Roberto; Scrimin, Paolo; Tonellato, Umberto
Tetrahedron Letters, 1983 , vol. 24, # 49 p. 5541 - 5542

Kokubo, Toshio; Uchida, Toshio; Tanimoto, Shigeo; Okano, Masaya; Sugimoto, Toyonari
Tetrahedron Letters, 1982 , vol. 23, # 15 p. 1593 - 1596