Vougalter, Vitali, and Vitaly Volpert. “Existence of Stationary Solutions for Some Systems of Integro-Differential Equations”. Discontinuity, Nonlinearity, and Complexity 5, no. 1 (March 1, 2016): 75–84. Accessed October 17, 2026. https://lhscientificpublishing.com/index.php/DNC/article/view/1986.