TY - JOUR AU - D. I. Bugrov TI - Bulgakov problem of the accumulation of perturbations JO - Vestnik Moskovskogo universiteta. Matematika, mehanika PY - 2011 SP - 39 EP - 43 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/VMUMM_2011_5_a6/ LA - ru ID - VMUMM_2011_5_a6 ER -