@article{ZVMMF_1986_26_5_a1,
     author = {A. S. Bratus'},
     title = {Multiple eigenvalues in problems of optimization of spectral properties of systems with a finite number of degrees of freedom},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {645--654},
     publisher = {mathdoc},
     volume = {26},
     number = {5},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1986_26_5_a1/}
}