@article{MZM_2008_84_3_a2,
     author = {I. V. Gorelyshev and A. I. Neishtadt},
     title = {Change of the {Ray} {Propagation} {Mode} in {Smoothly} {Irregular} {Waveguides}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {348--364},
     publisher = {mathdoc},
     volume = {84},
     number = {3},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2008_84_3_a2/}
}