TY - JOUR AU - P. V. Bibikov TI - On the geometry of quadratic second-order Abel ordinary differential equations JO - Fundamentalʹnaâ i prikladnaâ matematika PY - 2015 SP - 21 EP - 34 VL - 20 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/FPM_2015_20_2_a1/ LA - ru ID - FPM_2015_20_2_a1 ER -