Tetrahedron
Volume 52, Issue 41, 1996, Pages 15031-15070
Alan R. Katritzky, Stanislaw Rachwal and Bogumila Rachwal
Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, FL 32611-7200, U.S.A.
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http://dx.doi.org/10.1016/S0040-4020(96)00911-8