by Andrej Dujella and Christian Elsholtz
Reference:
Andrej Dujella and Christian Elsholtz, Sumsets being squares, Acta Mathematica Hungarica, 141(4), 353-357, (2013).
Bibtex Entry:
@Article{DujellaElsholtz2013,
author = {Andrej Dujella and Christian Elsholtz},
journal = {Acta Mathematica Hungarica},
title = {Sumsets being squares},
year = {2013},
number = {4},
pages = {353-357},
volume = {141},
doi = {10.1007/s10474-013-0334-8},
groups = {Project13 (Elsholtz), Faculty, External},
xxmrnumber = {3122293},
url = {http://www.math.tugraz.at/~elsholtz/WWW/papers/papers44.pdf},
}