@article{GDZPPN00124972X,
title = {The multiplicative behavior of H.},
journal = {Semigroup forum},
volume = {7},
year = {1974},
pages = {74-81},
zbl = {0296.20030},
url = {http://dml.mathdoc.fr/item/GDZPPN00124972X}
}
Grillet, Pierre Antoine. The multiplicative behavior of H.. Semigroup forum, Tome 7 (1974) pp. 74-81. http://gdmltest.u-ga.fr/item/GDZPPN00124972X/