@article{MZM_2009_86_5_a0,
     author = {T. Ya. Azizov and M. V. Chugunova},
     title = {Pontryagin's {Theorem} and {Spectral} {Stability} {Analysis} of {Solitons}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {643--658},
     publisher = {mathdoc},
     volume = {86},
     number = {5},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2009_86_5_a0/}
}