%0 Journal Article %T Free vibration and buckling analysis of functionally graded sandwich beams resting on a two-parameter elastic foundation using a quasi-3D theory %A MOHAMED, I. %A ŞİMŞEK, S. %A KAHYA, V. %J Sigma Journal of Engineering and Natural Sciences %D 2025 %V 43 %P 47-61 %R 10.14744/sigma.2025.00005