Critical points and level surfaces of multivalued functions
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Modern problems of mathematics. Differential equations, mathematical analysis and their applications, Tome 166 (1984), pp. 201-209.

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@article{TM_1984_166_a14,
     author = {S. P. Novikov},
     title = {Critical points and level surfaces of multivalued functions},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {201--209},
     publisher = {mathdoc},
     volume = {166},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1984_166_a14/}
}
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S. P. Novikov. Critical points and level surfaces of multivalued functions. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Modern problems of mathematics. Differential equations, mathematical analysis and their applications, Tome 166 (1984), pp. 201-209. http://geodesic.mathdoc.fr/item/TM_1984_166_a14/