@article{UZKU_2011_153_1_a13,
     author = {S. S. Alekseev and O. A. Zadvornov},
     title = {Existence of solutions of filtration problems with multi-valued law in nonhomogeneous media in the presence of a~point source},
     journal = {U\v{c}\"enye zapiski Kazanskogo universiteta. Seri\^a Fiziko-matemati\v{c}eskie nauki},
     pages = {168--179},
     publisher = {mathdoc},
     volume = {153},
     number = {1},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZKU_2011_153_1_a13/}
}