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Vonnegut, C. L., Shonkwiler, A. M., Khalifa, M. M., Zakharov, L. N., Johnson, D. W., & Haley, M. M. (2015). Facile Synthesis and Properties of 2-λ5-Phosphaquinolines and 2-λ5-Phosphaquinolin-2-ones. Angewandte Chemie International Edition, 54(45), 13318–13322. doi:10.1002/anie.201507696 
10.1002/anie.201507696