@article{ND_2015_11_3_a4,
     author = {A. P. Markeev},
     title = {On the fixed points stability for the area-preserving maps},
     journal = {Russian journal of nonlinear dynamics},
     pages = {503--545},
     publisher = {mathdoc},
     volume = {11},
     number = {3},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ND_2015_11_3_a4/}
}