Lawson, Alexander; Miles, D. H. 574. Some new mesoionic compounds. Journal of the Chemical Society (Resumed). 1 January 1959: 2865–2871. doi:10.1039/JR9590002865.
Gingrich, H. L.; Baum, J. S. In Oxazoles, Chemistry of Heterocyclic Compounds; Turchi, I. J., Ed.; Wiley: New York, 1986; Vol. 45. (doi:10.1002/9780470187289.ch4)
Gribble, G. W. In Oxazoles: Synthesis, Reactions, and Spectroscopy,
A; Palmer, D. C., Ed.; Wiley: New York, 2003; Vol. 60. (doi:10.1002/0471428035.ch4)