@article{FAA_1986_20_3_a2,
     author = {A. B. Givental'},
     title = {Lagrangian imbeddings of surfaces and unfolded {Whitney} umbrella},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {35--41},
     publisher = {mathdoc},
     volume = {20},
     number = {3},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1986_20_3_a2/}
}