%0 Journal Article %A G. V. Epifanov %T Reduction of a plane graph to an edge by star-triangle transformations %J Doklady Akademii Nauk %D 1966 %P 19-22 %V 166 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1966_166_1_a3/ %G ru %F DAN_1966_166_1_a3