@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/