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Krzysztof Felczak; Maria Bretner; Tadeusz Kulikowski; David Shugar. High-Yield Regioselective Thiation of Biologically Important Pyrimidinones, Dihydropyrimidinones and Their Ribo, 2'-Deoxyribo and 2', 3'-Dideoxyribo Nucleosides // Nucleosides, Nucleotides and Nucleic Acids, Volume 12, Issue 2 February 1993 , pages 245 - 261.
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dx.doi.org/10.1080/07328319308021210 
