@article{01538458,
title = {Research notes on a density problem of Erd\H os.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {22},
year = {1999},
pages = {655-658},
doi = {10.1155/S0161171299226555},
zbl = {0972.11009},
language = {en},
url = {http://dml.mathdoc.fr/item/01538458}
}
Akbik, Safwan. Research notes on a density problem of Erdős.. International Journal of Mathematics and Mathematical Sciences, Tome 22 (1999) pp. 655-658. doi : 10.1155/S0161171299226555. http://gdmltest.u-ga.fr/item/01538458/