@article{SM_2010_201_8_a4,
     author = {A. A. Oshemkov},
     title = {Classification of hyperbolic singularities of rank zero of integrable {Hamiltonian} systems},
     journal = {Sbornik. Mathematics},
     pages = {1153--1191},
     publisher = {mathdoc},
     volume = {201},
     number = {8},
     year = {2010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2010_201_8_a4/}
}