Preparation of 4-Substituted 3-Aroyl-1,2,5-thiadiazoles by the Reaction of Tetranitrogen Tetrasulfide with Diaroylmethanes and Aroylacetones - Mataka, Shuntaro; Hosoki, Akira; Takahashi, Kazufumi; Tashiro, Masashi (Synthesis, 1982)