Kristi Clark, Elliot Krop. Nonmedian Direct Products of Graphs with Loops. Ars Comb., 122:169-180, 2015.
@article{ClarkK15-0, title = {Nonmedian Direct Products of Graphs with Loops}, author = {Kristi Clark and Elliot Krop}, year = {2015}, researchr = {https://researchr.org/publication/ClarkK15-0}, cites = {0}, citedby = {0}, journal = {Ars Comb.}, volume = {122}, pages = {169-180}, }