TY - JOUR AU - M. V. Shamolin TI - An introduction to the problem of the braking of a body in a resisting medium, and a new two-parameter family of phase portraits JO - Vestnik Moskovskogo universiteta. Matematika, mehanika PY - 1996 SP - 57 EP - 69 IS - 4 UR - http://geodesic.mathdoc.fr/item/VMUMM_1996_4_a13/ LA - ru ID - VMUMM_1996_4_a13 ER -