Derev’yanko, N. V., and V. M. Kirilich. “Problem of Optimal Control for a Semilinear Hyperbolic System of Equations of the First Order With Infinite Horizon Planning”. Ukrains’kyi Matematychnyi Zhurnal 67, no. 2 (February 25, 2015): 185–201. Accessed November 29, 2022. https://umj.imath.kiev.ua/index.php/umj/article/view/1973.