“The Complete Integrability and Picard - Fuchs Equations of a Four-Dimensional Truncated Focker-Plank Hamiltonian System. I” (2001) Neliniini Kolyvannya, 4(2), pp. 264–271. Available at: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/170 (Accessed: 22 January 2026).