Kapustyan, V. E., and I. A. Pyshnograev. 2015. “Problem of Optimal Control for Parabolic-Hyperbolic Equations With Nonlocal Point Boundary Conditions and Semidefinite Quality Criterion”. Ukrains’kyi Matematychnyi Zhurnal 67 (8), 1068-81. https://umj.imath.kiev.ua/index.php/umj/article/view/2046.