TY - JOUR AU - M. V. Men'shikov AU - K. D. Pelikh TI - Percolation with several defect types. An estimate of critical probability for a square lattice JO - Matematičeskie zametki PY - 1989 SP - 38 EP - 47 VL - 46 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_1989_46_4_a5/ LA - ru ID - MZM_1989_46_4_a5 ER -