@article{MZM_1989_46_4_a5,
     author = {M. V. Men'shikov and K. D. Pelikh},
     title = {Percolation with several defect types. {An} estimate of critical probability for a square lattice},
     journal = {Matemati\v{c}eskie zametki},
     pages = {38--47},
     publisher = {mathdoc},
     volume = {46},
     number = {4},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1989_46_4_a5/}
}