@article{DMGT_2012_32_3_a10,
     author = {Sopena, \'Eric},
     title = {Upper oriented chromatic number of undirected graphs and oriented colorings of product graphs},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {517--533},
     publisher = {mathdoc},
     volume = {32},
     number = {3},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_2012_32_3_a10/}
}