@article{AM2_1992__43_1_137439,
     author = {Claudi Alsina},
     title = {On a method of {Pi-Calleja} for describing additive generators of associative functions.},
     journal = {Aequationes mathematicae},
     pages = {14--20},
     year = {1992},
     volume = {43},
     number = {1},
     zbl = {0765.39005},
     url = {http://geodesic.mathdoc.fr/item/AM2_1992__43_1_137439/}
}