S. M. Khripak, A. A. Dobosh and I. V. Smolanka; "Synthesis of cyclohexeno[1′,2′ ∶ 2,3]thieno[4,-5-e]-1,3H-pyrimidin-4-one-2-thione and some of its derivatives "; Chemistry of Heterocyclic Compounds; vol. 9; (1973); p. 525 - 526;
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dx.doi.org/10.1007/BF00471545
