@article{FAA_1991_25_4_a5,
     author = {V. N. Pyvovarchyk},
     title = {Polynomial operator pencils connected with problems of mechanics},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {62--64},
     year = {1991},
     volume = {25},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1991_25_4_a5/}
}