@article{MZM_2011_90_2_a10,
     author = {D. A. Stepanov},
     title = {Smooth {Three-Dimensional} {Canonical} {Thresholds}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {285--299},
     publisher = {mathdoc},
     volume = {90},
     number = {2},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2011_90_2_a10/}
}