David Joyce. Generalized chromatic polynomials. Discrete Mathematics, 50:51-62, 1984. [doi]
@article{Joyce84, title = {Generalized chromatic polynomials}, author = {David Joyce}, year = {1984}, doi = {10.1016/0012-365X(84)90034-7}, url = {http://dx.doi.org/10.1016/0012-365X(84)90034-7}, researchr = {https://researchr.org/publication/Joyce84}, cites = {0}, citedby = {0}, journal = {Discrete Mathematics}, volume = {50}, pages = {51-62}, }