TY - JOUR AU - A. N. Veissenberg TI - A~transformation of the system of differential equations of a~perturbed motion in the critical case with an even number of zero roots JO - Izvestiâ vysših učebnyh zavedenij. Matematika PY - 1968 SP - 41 EP - 47 IS - 11 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/IVM_1968_11_a4/ LA - ru ID - IVM_1968_11_a4 ER -