@article{00528835,
title = {Commutativity theorem for },
journal = {Mathematica Pannonica},
volume = {4},
year = {1993},
pages = {181-190},
zbl = {0796.16027},
language = {en},
url = {http://dml.mathdoc.fr/item/00528835}
}
Abujabal, Hamza A.S.; Perić, Veselin. Commutativity theorem for . Mathematica Pannonica, Tome 4 (1993) pp. 181-190. http://gdmltest.u-ga.fr/item/00528835/