Romanov, S. S. (2004) “Piecewise-maximum closed Geodesic trajectories on bounded Toroidal manifolds”, Ukrains’kyi Matematychnyi Zhurnal, 56(8), pp. 1139–1142. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3829 (Accessed: 4May2024).