@article{MZM_1976_19_4_a14,
     author = {V. I. Frolov},
     title = {Estimate for the spectrum of an operator bundle and its application to stability problems},
     journal = {Matemati\v{c}eskie zametki},
     pages = {611--614},
     publisher = {mathdoc},
     volume = {19},
     number = {4},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1976_19_4_a14/}
}