Olah, George A.; Wu, An-hsiang; Farooq, Omar
Journal of Organic Chemistry, 1988 , vol. 53, # 21 p. 5143 - 5145

Krasutsky, Pavel A.; Kolomitsin, Igor V.; Carlson, Robert M.; Jones Jr., Maitland
Tetrahedron Letters, 1996 , vol. 37, # 32 p. 5673 - 5674