@article{MZM_1997_61_2_a3,
     author = {O. V. Lychagina},
     title = {Normal forms of {Poisson} structures},
     journal = {Matemati\v{c}eskie zametki},
     pages = {220--235},
     year = {1997},
     volume = {61},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1997_61_2_a3/}
}