TY - JOUR AU - A. S. Demidov TI - On the evolution of a~weak perturbation of a~circle in the problem of a~Hele--Shaw flow JO - Trudy Matematicheskogo Instituta imeni V.A. Steklova PY - 2002 SP - 1212 EP - 1214 VL - 57 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/RM_2002_57_6_a5/ LA - en ID - RM_2002_57_6_a5 ER -