@article{MZM_1989_45_5_a13,
     author = {V. A. Kozlov},
     title = {On the spectrum of an operator pencil generated by the {Dirichlet} problem for an elliptic equation at a corner point},
     journal = {Matemati\v{c}eskie zametki},
     pages = {117--118},
     publisher = {mathdoc},
     volume = {45},
     number = {5},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1989_45_5_a13/}
}