@article{MZM_2011_90_6_a2,
     author = {\`E. F. Akhmerova},
     title = {Asymptotics of the {Spectrum} of {Nonsmooth} {Perturbations} of {Differential} {Operators} of {Order} $2m$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {833--844},
     publisher = {mathdoc},
     volume = {90},
     number = {6},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2011_90_6_a2/}
}