@article{FAA_1973_7_2_a4,
     author = {V. M. Zakalyukin},
     title = {The versality theorem},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {28--31},
     publisher = {mathdoc},
     volume = {7},
     number = {2},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1973_7_2_a4/}
}