Geodesic
Singularities of integrable Hamiltonian systems with the same boundary foliation. An infinite series
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 5 (2016), pp. 14-20 Cet article a éte moissonné depuis la source Math-Net.Ru

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Four-dimensional momentum map singularities of integrable Hamiltonian systems of two degrees of freedom are considered. A construction of an infinite series of pairs of 4-dimensional saddle-saddle singularities is provided so that 4-singularities are not Liouville equivalent in each pair and the 2-foliations on their 3-boundaries are Liouville equivalent. 
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     author = {M. A. Tuzhilin},
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M. A. Tuzhilin. Singularities of integrable Hamiltonian systems with the same boundary foliation. An infinite series. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 5 (2016), pp. 14-20. http://geodesic.mathdoc.fr/item/VMUMM_2016_5_a1/

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