Dennis P. Geller. Coding graphs by contractions. Networks, 6(1):23-33, 1976. [doi]
@article{Geller76-0,
title = {Coding graphs by contractions},
author = {Dennis P. Geller},
year = {1976},
doi = {10.1002/net.3230060103},
url = {http://dx.doi.org/10.1002/net.3230060103},
researchr = {https://researchr.org/publication/Geller76-0},
cites = {0},
citedby = {0},
journal = {Networks},
volume = {6},
number = {1},
pages = {23-33},
}