Harusawa, Shinya; Shioiri, Takayuki
Tetrahedron Letters, 1982 , vol. 23, # 4 p. 447 - 448

Vigalok, I. V.; Petrova, G. G.; Lukashina, S. G.; Vigalok, A. A.; Levin, Ya. A.
Journal of Organic Chemistry USSR (English Translation), 1980 , vol. 16, # 7 p. 1239 - 1243
Zhurnal Organicheskoi Khimii, 1980 , vol. 16, # 7 p. 1442 - 1447