@article{VMUMM_2011_2_a1,
     author = {A. A. Oshemkov},
     title = {Saddle singularities of complexity $1$ of integrable {Hamiltonian} systems},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {10--20},
     publisher = {mathdoc},
     number = {2},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2011_2_a1/}
}