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@article{DAN_1981_260_1_a6, author = {S. P. Novikov}, title = {Multivalued functions and functionals. {An} analogue of the {Morse} theory}, journal = {Doklady Akademii Nauk}, pages = {31--35}, publisher = {mathdoc}, volume = {260}, number = {1}, year = {1981}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1981_260_1_a6/} }
S. P. Novikov. Multivalued functions and functionals. An analogue of the Morse theory. Doklady Akademii Nauk, Tome 260 (1981) no. 1, pp. 31-35. http://geodesic.mathdoc.fr/item/DAN_1981_260_1_a6/