AllahabiF., IbragimovG. I., and KuchkarovA. “A Pursuit Problem in an Infinite System of Second-Order Differential Equations”. Ukrains’kyi Matematychnyi Zhurnal 65, no. 8 (August 25, 2013): 1080–1091. Accessed November 21, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2491.