TY - JOUR AU - Mandl, Petr TI - Martingale methods in discrete state random processes JO - Kybernetika PY - 1982 SP - 1 EP - 56 VL - 18 IS - Suppl UR - http://geodesic.mathdoc.fr/item/KYB_1982_18_Suppl_a0/ LA - en ID - KYB_1982_18_Suppl_a0 ER -