@article{MZM_1995_58_5_a2,
     author = {V. A. Dobrynskii},
     title = {Critical sets and unimodal mappings of the square},
     journal = {Matemati\v{c}eskie zametki},
     pages = {669--680},
     year = {1995},
     volume = {58},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1995_58_5_a2/}
}