@article{IM2_2022_86_5_a2,
     author = {V. K. Beloshapka},
     title = {Modification of {Poincar\'} e's
},
     journal = {Izvestiya. Mathematics },
     pages = {852--875},
     publisher = {mathdoc},
     volume = {86},
     number = {5},
     year = {2022},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2022_86_5_a2/}
}