TY - JOUR AU - V. N. Dubinin AU - E. V. Kostyuchenko TI - Extremal problems in the function theory associated with the $n$-fold symmetry JO - Zapiski Nauchnykh Seminarov POMI PY - 2001 SP - 83 EP - 111 VL - 276 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/ZNSL_2001_276_a4/ LA - ru ID - ZNSL_2001_276_a4 ER -