@article{TRSPY_1998_220_a8,
     author = {A. F. Izmailov},
     title = {Some generalizations of the {Morse} lemma},
     journal = {Informatics and Automation},
     pages = {142--156},
     publisher = {mathdoc},
     volume = {220},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1998_220_a8/}
}