@article{IVM_2012_1_a2,
     author = {D. B. Zot'ev},
     title = {Fomenko{\textendash}Zieschang invariants of integrable systems with symplectic singularities},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {22--30},
     year = {2012},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2012_1_a2/}
}