Jiangmin Pan, Yin Liu. There exist no arc-regular prime-valent graphs of order four times an odd square-free integer. Discrete Mathematics, 313(22):2575-2581, 2013. [doi]
@article{PanL13,
title = {There exist no arc-regular prime-valent graphs of order four times an odd square-free integer},
author = {Jiangmin Pan and Yin Liu},
year = {2013},
doi = {10.1016/j.disc.2013.08.009},
url = {http://dx.doi.org/10.1016/j.disc.2013.08.009},
researchr = {https://researchr.org/publication/PanL13},
cites = {0},
citedby = {0},
journal = {Discrete Mathematics},
volume = {313},
number = {22},
pages = {2575-2581},
}