@article{DE_2004_40_7_a1,
     author = {E. G. D'yakonov},
     title = {On {Spectral} {Problems} in {Energy} {Spaces} on {Composite} {Manifolds} with {Singular} {Geometry} of the {Blocks:~I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {874--886},
     year = {2004},
     volume = {40},
     number = {7},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2004_40_7_a1/}
}