@article{04061506,
title = {On a variation of Sands' method.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {9},
year = {1986},
pages = {597-604},
doi = {10.1155/S0161171286000753},
zbl = {0651.20034},
language = {en},
url = {http://dml.mathdoc.fr/item/04061506}
}
Obaid, Evelyn E. On a variation of Sands' method.. International Journal of Mathematics and Mathematical Sciences, Tome 9 (1986) pp. 597-604. doi : 10.1155/S0161171286000753. http://gdmltest.u-ga.fr/item/04061506/