@article{01417986,
title = {A simple characterization of commutative },
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {22},
year = {1999},
pages = {885-888},
doi = {10.1155/S0161171299228852},
zbl = {0966.46030},
language = {en},
url = {http://dml.mathdoc.fr/item/01417986}
}
Saworotnow, Parfeny P. A simple characterization of commutative . International Journal of Mathematics and Mathematical Sciences, Tome 22 (1999) pp. 885-888. doi : 10.1155/S0161171299228852. http://gdmltest.u-ga.fr/item/01417986/