TY - JOUR TI - Bogolyubov Conference “Problems of Theoretical and Mathematical Physics” JO - Trudy Matematicheskogo Instituta imeni V.A. Steklova PY - 1998 VL - 53 IS - 6 UR - http://geodesic.mathdoc.fr/item/RM_1998_53_6_a24/ LA - ru ID - RM_1998_53_6_a24 ER -