Khamsemanan N. NIELSEN THEORY AND SOME SELECTED APPLICATIONS TO DIFFERENTIAL AND INTEGRAL EQUATIONS; A BRIEF SURVEY. J. Nonlinear Anal. Optim. [internet]. 2011 Dec. 21 [cited 2026 Sep. 2];2(1):19-25. available from: https://ph03.tci-thaijo.org/index.php/jnao/article/view/2609