1. Basu, U. P.; Dhar, S. P. J. Indian Chem. Soc. 1946, 23, 189. Takasaki, K.; Kaneko, M.; Fujii, T.; Kobayashi, H. Nippon Yakurigaku Zasshi 1973, 69, 977. Honna, R.; Ogawa, K.; Tanaka, M.; Yamada, S.; Toratani, K.; Hashimoto, S. Jpn. Kokai Tokkyo Koho JP 79 14,968; Chem. Abstr. 1980, 92, 41920.
2. Honna, R.; Ogawa, K; Miyoshi, O; Hashimoto, S.; Suzue, T. Jpn. Kokai Tokkyo Koho JP 79 09,278; Chem. Abstr. 1979, 91, 20483. Heubach, G.; Hoerlein, G.; Sachse, B. Ger. Offen. Patent 2,225,023; Chem. Abstr. 1977, 86, 106569. Kaemmerer, F. J.; Schleyerbach, R. Ger. Offen. Patents 2,854,438 and 2,854,439; Chem. Abstr. 1980, 93, 239392 and 239393
3. Grünanger, P.; Vita-Finzi, P. In The Chemistry of Heterocyclic Compounds, Isoxazoles, Part I; Weissenberger and Taylor, Eds.; Wiley-Interscience, New York, 1991.
4. Weygand, C.; Bauer, E. Ann. 1927, 123, 459. Quilico, A.; Speroni, G. Gazz. Chim. Ital. 1946, 76, 148.
5. Quilico, A.; Stagno D’Alcontres, G. Gazz. Chim. Ital. 1949, 79, 654. Bertini, V.; De Munno, A.; Pelosi, P.; Pino, P. J. Heterocycl. Chem. 1968, 5, 621. Yedidia, V.; Leznoff, C. C. Can. J. Chem. 1980, 58, 1144.