@article{IIGUM_2021_38_a3,
     author = {P. A. Shaikhullina},
     title = {About formal normal form of the semi-hyperbolic maps germs on the plane},
     journal = {The Bulletin of Irkutsk State University. Series Mathematics},
     pages = {54--64},
     publisher = {mathdoc},
     volume = {38},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IIGUM_2021_38_a3/}
}