Liu, Hsing-Jang; Bukownik, Rudolf R.; Pednekar, Purushottam R.
Synthetic Communications, 1981 , vol. 11, # 8 p. 599 - 604

Yamada, Yasuji; Ishii, Toshihide; Kimura, Masayuki; Hosaka, Kunio
Tetrahedron Letters, 1981 , vol. 22, # 14 p. 1353 - 1354