Orban, John; Turner, John V.; Twitchin, Bruce
Tetrahedron Letters, 1984 , vol. 25, # 44 p. 5099 - 5102

Liu, Chunjian; Bao, Guanglin; Burnell, D. Jean
Journal of the Chemical Society. Perkin Transactions 1, 2001 , # 20 p. 2644 - 2656