@article{DM_1991_3_4_a3,
     author = {O. V. Borodin},
     title = {Joint generalization of the theorems of {Lebesgue} and {Kotzig} on the combinatorics of planar maps},
     journal = {Diskretnaya Matematika},
     pages = {24--27},
     publisher = {mathdoc},
     volume = {3},
     number = {4},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1991_3_4_a3/}
}