@article{MZM_2001_69_4_a0,
     author = {V. V. Belov and O. S. Dobrokhotov and S. Yu. Dobrokhotov},
     title = {Isotropic {Tori,} {Complex} {Germ} and {Maslov} {Index,} {Normal} {Forms} and {Quasimodes} of {Multidimensional} {Spectral} {Problems}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {483--514},
     publisher = {mathdoc},
     volume = {69},
     number = {4},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2001_69_4_a0/}
}