@article{VMUMM_2008_5_a10,
     author = {D. A. Permyakov},
     title = {Classification of immersions of graphs into a plane},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {55--56},
     publisher = {mathdoc},
     number = {5},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2008_5_a10/}
}