@article{DAN_1965_163_5_a4,
     author = {A. S. Markus},
     title = {Multiple completeness and convergence of multiple expansions in the system of eigenvectors and adjoined vectors of an operator pencil},
     journal = {Doklady Akademii Nauk},
     pages = {1061--1064},
     publisher = {mathdoc},
     volume = {163},
     number = {5},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_163_5_a4/}
}