Kokotos; Tzougraki
Journal of Heterocyclic Chemistry, 1986 , vol. 23, # 1 p. 87 - 92

Girouard, Stephane; Houle, Marie-Helene; Grandbois, Alain; Keillor, Jeffrey W.; Michnick, Stephen W.
Journal of the American Chemical Society, 2005 , vol. 127, # 2 p. 559 - 566

Keillor, Jeffrey W.; Michnick, Stephen W.; Girouard, Stephane
Patent: US2006/147948 A1, 2006 ;