@article{GDZPPN002037696,
title = {The associativity equation revisited.},
journal = {Aequationes mathematicae},
volume = {38},
year = {1989},
pages = {306-312},
zbl = {0676.39005},
url = {http://dml.mathdoc.fr/item/GDZPPN002037696}
}
Craigen, R.; Páles, Z. The associativity equation revisited.. Aequationes mathematicae, Tome 38 (1989) pp. 306-312. http://gdmltest.u-ga.fr/item/GDZPPN002037696/