Evguenia Kopylova, William F. Smyth. The three squares lemma revisited. J. Discrete Algorithms, 11:3-14, 2012. [doi]
@article{KopylovaS12,
title = {The three squares lemma revisited},
author = {Evguenia Kopylova and William F. Smyth},
year = {2012},
doi = {10.1016/j.jda.2011.03.009},
url = {http://dx.doi.org/10.1016/j.jda.2011.03.009},
researchr = {https://researchr.org/publication/KopylovaS12},
cites = {0},
citedby = {0},
journal = {J. Discrete Algorithms},
volume = {11},
pages = {3-14},
}