@article{VMUMM_1988_4_a4,
     author = {A. A. Shkalikov},
     title = {Selection principles and properties of a part of eigen- and associated elements of operator pencils},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {16--25},
     year = {1988},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1988_4_a4/}
}