kheirabadi A, Mahmoudzadeh Vaziri A, Effati S. Solving Fractional Variational Problem Via an Orthonormal Function. Stat., optim. inf. comput. [Internet]. 2019May19 [cited 2025Dec.14];7(2):447-55. Available from: http://www.iapress.org/index.php/soic/article/view/soic.190614