-Cyclic condensations of 2-amino-1,3,4-thiadiazole with 1,3-dicarbonyl compounds.
R. F. Lauer, G. Zenchoff.
Journal of Heterocyclic Chemistry, Volume 13, Issue 2, pages 291–293, April 1976.
DOI: 10.1002/jhet.5570130218.
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http://dx.doi.org/10.1002/jhet.5570130218