El-nabulsi RA, Rezazadeh H. NON-STANDARD LAGRANGIANS WITH DIFFERENTIALS OPERATORS. J. Nonlinear Anal. Optim. [internet]. 2013 Jun. 28 [cited 2026 Sep. 2];5(2):21-35. available from: https://ph03.tci-thaijo.org/index.php/jnao/article/view/2747