@article{VMUMM_2016_5_a1,
     author = {M. A. Tuzhilin},
     title = {Singularities of integrable {Hamiltonian} systems with the same boundary foliation. {An} infinite series},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {14--20},
     publisher = {mathdoc},
     number = {5},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2016_5_a1/}
}