@article{DMGT_1997_17_2_a1,
     author = {Mitchem, John and Morriss, Patrick and Schmeichel, Edward},
     title = {On the cost chromatic number of outerplanar, planar, and line graphs},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {229--241},
     publisher = {mathdoc},
     volume = {17},
     number = {2},
     year = {1997},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_1997_17_2_a1/}
}