Sacharuck Pornpeerakeat & Sakda Katawaethwarag. (2022). Chebyshev-Lagrange Multipliers Technique for Vibration Analysis of Functionally Graded Material Beams Using Various Beam Theories.
            <i>Advances in Applied Mathematics and Mechanics</i>. <i>14</i> (4).
            871-892.
         doi:10.4208/aamm.OA-2020-0301