Geodesic
Degenerate smooth mappings
Matematičeskie zametki, Tome 14 (1973) no. 4, pp. 509-516 
M. L. Gromov. Degenerate smooth mappings. Matematičeskie zametki, Tome 14 (1973) no. 4, pp. 509-516. http://geodesic.mathdoc.fr/item/MZM_1973_14_4_a6/
@article{MZM_1973_14_4_a6,
     author = {M. L. Gromov},
     title = {Degenerate smooth mappings},
     journal = {Matemati\v{c}eskie zametki},
     pages = {509--516},
     year = {1973},
     volume = {14},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1973_14_4_a6/}
}
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UR  - http://geodesic.mathdoc.fr/item/MZM_1973_14_4_a6/
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Voir la notice de l'article provenant de la source Math-Net.Ru

Smooth mappings $X\to Y$ are studied, whose rank at each point $x\in X$ does not exceed a given number $k$.