Khamsemanan, N. “NIELSEN THEORY AND SOME SELECTED APPLICATIONS TO DIFFERENTIAL AND INTEGRAL EQUATIONS; A BRIEF SURVEY”. Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO) 2, no. 1 (December 21, 2011): 19–25. accessed September 2, 2026. https://ph03.tci-thaijo.org/index.php/jnao/article/view/2609.