Yazdizadeh, Behrooz, and H.H. Yeghiazaryan. “SOME FEM MODELS FOR BENDING AND VIBRATION PROBLEMS OF BEAM”. Proceedings of the YSU A: Physical and Mathematical Sciences, vol. 47, no. 1 (230), Apr. 2013, pp. 38-43, doi:10.46991/PYSU:A/2013.47.1.038.