@article{IIMI_2006_37_3_a30,
     author = {A. I. Korobko},
     title = {The density principle and approximation of perturbed inclusions},
     journal = {Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta},
     pages = {69--70},
     publisher = {mathdoc},
     volume = {37},
     number = {3},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IIMI_2006_37_3_a30/}
}