@article{05014477,
title = {Difference density and aperiodic sum-free sets.},
journal = {Integers},
volume = {5},
year = {2005},
zbl = {1107.11013},
language = {en},
url = {http://dml.mathdoc.fr/item/05014477}
}
Calkin, Neil J.; Finch, Steven R.; Flowers, Timothy B. Difference density and aperiodic sum-free sets.. Integers, Tome 5 (2005) . http://gdmltest.u-ga.fr/item/05014477/