Missio, Lauri J.; Braibante, Hugo S.; Braibante, Mara E. F.
Journal of Heterocyclic Chemistry, 1996 , vol. 33, # 4 p. 1243 - 1245

Jung, Jae C.; Watkins, E Blake; Avery, Mitchell A.
Synthetic Communications, 2002 , vol. 32, # 24 p. 3767 - 3777