@article{10_4153_CMB_2012_031_5,
     author = {Geschke, Stefan},
     title = {2-dimensional {Convexity} {Numbers} and {P} 4-free {Graphs}},
     journal = {Canadian mathematical bulletin},
     pages = {61--71},
     year = {2014},
     volume = {57},
     number = {1},
     doi = {10.4153/CMB-2012-031-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2012-031-5/}
}