@article{JaentschiL302 ,year = "2002" ,journal = "Leonardo Electronic Journal of Practices and Technologies" ,jabbre1 = "Leonardo Electron. J. Pract. Technol." ,jabbre2 = "Leonardo Electron J Pract Technol" ,title = "Graph theory. 2. Vertex descriptors and graph coloring" ,author = "Jäntschi, Lorentz" ,volume = "1" ,number = "1" ,pages = "37-52" ,ISSN = "1583-1078" ,url = "http://lori.academicdirect.org/pdfs/100/019.pdf" }