%0 Journal Article %A Tobias Müller %A Attila Pór %A Jean-Sébastien Sereni %T Graphs with four boundary vertices %J The electronic journal of combinatorics %D 2011 %V 18 %N 1 %U http://geodesic.mathdoc.fr/articles/10.37236/498/ %R 10.37236/498 %F 10_37236_498