@article{MZM_1990_48_2_a0,
     author = {V. K. Beloshapka},
     title = {Construction of the normal form of the equation of a~surface of high codimension},
     journal = {Matemati\v{c}eskie zametki},
     pages = {3--9},
     year = {1990},
     volume = {48},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1990_48_2_a0/}
}