Richard Hammack, Heather Smith. Zero Divisors Among Digraphs. Graphs and Combinatorics, 30(1):171-181, 2014. [doi]
@article{HammackS14,
title = {Zero Divisors Among Digraphs},
author = {Richard Hammack and Heather Smith},
year = {2014},
doi = {10.1007/s00373-012-1248-x},
url = {http://dx.doi.org/10.1007/s00373-012-1248-x},
researchr = {https://researchr.org/publication/HammackS14},
cites = {0},
citedby = {0},
journal = {Graphs and Combinatorics},
volume = {30},
number = {1},
pages = {171-181},
}