@article{JGAA_2015_19_1_a0,
     author = {St\'ephane Bessy and Daniel Gon\c{c}alves and Jean-S\'ebastien Sereni},
     title = {Two-floor buildings need eight colors},
     journal = {Journal of Graph Algorithms and Applications},
     pages = {1--9},
     publisher = {mathdoc},
     volume = {19},
     number = {1},
     year = {2015},
     doi = {10.7155/jgaa.00344},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.7155/jgaa.00344/}
}