TY - JOUR AU - S. K. Vodopyanov TI - Isoperimetric relations and conditions for the extension of JO - Doklady Akademii Nauk PY - 1987 SP - 11 EP - 15 VL - 292 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1987_292_1_a0/ LA - ru ID - DAN_1987_292_1_a0 ER -