S.-F. Yao, Z.-S. Cai, X.-J. Huang, and L.-X. Song, “Preparation of Salicylic Nitrile through Direct Catalytic Dehydration of Salicylamide with Immobilized Phosphoric Acid as Catalyst”, ajc, vol. 32, no. 5, pp. 1082–1086, Apr. 2020.