Phuong, N. T. B., T. M. Tu, H. T. Phuong, and N. V. Long. “Bending Analysis of Functionally Graded Beam With Porosities Resting on Elastic Foundation Based on Neutral Surface Position”. Journal of Science and Technology in Civil Engineering (JSTCE) - HUCE, vol. 13, no. 1, Jan. 2019, pp. 33-45, doi:10.31814/stce.nuce2019-13(1)-04.