Van Allan, J. A., Reynolds, G. A., Alessi, J. T., Chie Chang, S., C. Joines, R. (1971). Reactions of 4‐pyrones with primary amines. A new class of ionic associates. Journal of Heterocyclic Chemistry 8 (6): 919–922. DOI:10.1002/jhet.5570080606.
Franz Müller and Arnold P. Applebyki "Weed Control, 2. Individual Herbicides" in Ullmann's Encyclopedia of Industrial Chemistrym 2010 DOI:10.1002/14356007.o28_o01