%0 Journal Article %A T. R. Riley %A W. P. Thurston %T The absence of efficient dual pairs of spanning trees in planar graphs %J The electronic journal of combinatorics %D 2006 %V 13 %U http://geodesic.mathdoc.fr/articles/10.37236/1151/ %R 10.37236/1151 %F 10_37236_1151