@article{KUKZ_1978_15_15_a22,
     author = {N. D. Yakimov},
     title = {Variational properties of some inverse boundary value problems of filtration},
     journal = {Trudy seminara po kraevym zada\v{c}am},
     pages = {191--201},
     publisher = {mathdoc},
     volume = {15},
     number = {15},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUKZ_1978_15_15_a22/}
}