@article{10_37236_1151,
     author = {T. R. Riley and W. P. Thurston},
     title = {The absence of efficient dual pairs of spanning trees in planar graphs},
     journal = {The electronic journal of combinatorics},
     year = {2006},
     volume = {13},
     doi = {10.37236/1151},
     zbl = {1097.05015},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1151/}
}