@article{TM_1997_213_a8,
     author = {S. I. Trifonov},
     title = {Cyclicity of elementary polycycles of generic smooth vector fields},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {152--212},
     publisher = {mathdoc},
     volume = {213},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1997_213_a8/}
}