1.
Fedorchuk VM, Fedorchuk VI. On new differential equations of the first order in the space M(1,4) × R(u) with non-trivial symmetries. Ann. Univ. Paedagog. Crac. Stud. Math. [Internet]. 2003 May 27 [cited 2026 Oct. 30];3:49-53. Available from: https://studmath.uken.krakow.pl/article/view/13466