S. Daoud, P. Kumar Saini, and H. Rekab-Djabri, “Elastic constants and optical phonon frequencies of BX (X= P, As, and Sb) semiconductors: Semi-empirical prediction”, IJPR, vol. 8, no. 2, pp. 45–49, Sep. 2020, doi: 10.14419/ijpr.v8i2.31001.