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Journal of Heterocyclic Chemistry 1975, Volume 12, pp. 337-342
Heterocycles. CXXVII. Action of Sulfur on Some Heterocyclic Compounds. Formation of Thioamides, Oxidative Cyclization and Thiation.
L.Kramberger, P.Lorencak, S.Polanc, B.Vercek, B.Stanovnik, M.Tisler, F.Povazanec
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https://www.jhetchem.com/cd2html.php?file=19750337