@article{VMUMM_1985_4_a3,
     author = {I. B. Mikhailovskaya},
     title = {Discrete spectrum of a dynamic matrix},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {20--25},
     publisher = {mathdoc},
     number = {4},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1985_4_a3/}
}