Chiang, Chian C.; Paul, Iain C.; Anastassiou, A. G.; Eachus, S. W. (1974). "Molecular structure of an N-substituted azonine. Demonstration of polyenic character in a member of this class of compounds". Journal of the American Chemical Society. 96 (5): 1636–1638. doi:10.1021/ja00812a082. ISSN0002-7863.
Chiang, Chian C.; Paul, Iain C.; Anastassiou, A. G.; Eachus, S. W. (1974). "Molecular structure of an N-substituted azonine. Demonstration of polyenic character in a member of this class of compounds". Journal of the American Chemical Society. 96 (5): 1636–1638. doi:10.1021/ja00812a082. ISSN0002-7863.