Maligres, Peter E.; Waters, Marjorie S.; Weissman, Steven A.; McWilliams, J. Christopher; Lewis, Stephanie; Cowen, Jennifer; Reamer, Robert A.; Volante; Reider, Paul J.; Askin, David Journal of Heterocyclic Chemistry, 2003 , vol. 40, # 2 p. 229 - 241