B. M. Bitrus, C. M. Nwabueze, J. U. Ojar, and E. S. . Eyube, “RO-VIBRATIONAL PARTITION FUNCTION AND MEAN THERMAL ENERGY OF THE IMPROVED WEI OSCILLATOR”, FJS, vol. 5, no. 1, pp. 261–270, Jun. 2021, doi: 10.33003/fjs-2021-0501-564.