1)M. Farber, H. Osiander, T. Severin
Synthesis of N-Substituted 3-Hydroxy-2-methyl-4-pyridones and -pyridonimines
J Het Chem 1994, Volume 31, pp. 947-956
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https://www.jhetchem.com/cd2html.php?file=19940947
Trifluoromethyl Substituted 4-Pyrones via Self-condensation of Trifluoroacetoacetates
J Het Chem 1991, Volume 28, pp. 819-821
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https://www.jhetchem.com/cd2html.php?file=19910819