@article{FAA_1987_21_1_a14,
     author = {A. S. Markus and V. I. Matsaev},
     title = {Basis property of subsystems of eigen- and associated vectors of a self-adjoint operator pencil},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {82--83},
     publisher = {mathdoc},
     volume = {21},
     number = {1},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1987_21_1_a14/}
}