@article{DAN_1991_317_3_a22,
     author = {S. E. Kholodovskii},
     title = {Filtration through strata with ring-shaped, nonhomogeneous, anisotropic zones, cracks and screens},
     journal = {Doklady Akademii Nauk},
     pages = {606--608},
     year = {1991},
     volume = {317},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_317_3_a22/}
}