Dennis P. Geller. r-tuple colorings of uniquely colorable graphs. Discrete Mathematics, 16(1):9-12, 1976. [doi]
@article{Geller76-1,
title = {r-tuple colorings of uniquely colorable graphs},
author = {Dennis P. Geller},
year = {1976},
doi = {10.1016/0012-365X(76)90089-3},
url = {http://dx.doi.org/10.1016/0012-365X(76)90089-3},
researchr = {https://researchr.org/publication/Geller76-1},
cites = {0},
citedby = {0},
journal = {Discrete Mathematics},
volume = {16},
number = {1},
pages = {9-12},
}