@article{MM_2001_13_12_a9,
     author = {V. A. Sobolev},
     title = {Geometry of singular perturbations in degenerated cases},
     journal = {Matemati\v{c}eskoe modelirovanie},
     pages = {75--94},
     publisher = {mathdoc},
     volume = {13},
     number = {12},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MM_2001_13_12_a9/}
}