1.
Le BH, Thuy TM. Optimal design for eigen-frequencies of a longitudinal bar using Pontryagin’s maximum principle considering the influence of concentrated mass. Vietnam J. Mech. [Internet]. 2017 Mar. 28 [cited 2024 Apr. 20];39(1):1-12. Available from: https://vjs.ac.vn/index.php/vjmech/article/view/6058