BibTex format
@article{LIEBECK:1982:10.1002/jgt.3190060217,
author = {LIEBECK, MW},
doi = {10.1002/jgt.3190060217},
journal = {JOURNAL OF GRAPH THEORY},
pages = {215--218},
title = {GRAPHS WITH NILPOTENT ADJACENCY MATRICES},
url = {http://dx.doi.org/10.1002/jgt.3190060217},
volume = {6},
year = {1982}
}