TY - JOUR AU - E. I. Stepanova TI - Bifurcations of minimal fillings for four points on the Euclidean plane JO - Fundamentalʹnaâ i prikladnaâ matematika PY - 2019 SP - 253 EP - 261 VL - 22 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/FPM_2019_22_6_a10/ LA - ru ID - FPM_2019_22_6_a10 ER -