@article{MZM_2013_94_4_a13,
     author = {A. {\CYRF}. Belyaev},
     title = {Sungular {Perturbations} of {Powers} of the {Laplacian} on the {Torus}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {632--636},
     publisher = {mathdoc},
     volume = {94},
     number = {4},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2013_94_4_a13/}
}