%0 Journal Article %A D. A. Permyakov %T Classification of immersions of graphs into a plane %J Vestnik Moskovskogo universiteta. Matematika, mehanika %D 2008 %P 55-56 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/VMUMM_2008_5_a10/ %G ru %F VMUMM_2008_5_a10