M. Rani, D. Kumar Shukla, and A. Ali Khan, “Synthesis of 3-(4-Methyl-phenyl)-2-phenyl-3,4-dihydro-2H-benzo[e][1,3,2]oxazaphosphinine and Its Chalcogenides”, ajc, vol. 25, no. 6, pp. 3449–3451, Jan. 2013.