@article{10_4064_ap_53_1_1_5,
     author = {Claudi Alsina},
     title = {On the stability of a functional equation related to associativity},
     journal = {Annales Polonici Mathematici},
     pages = {1--5},
     publisher = {mathdoc},
     volume = {53},
     number = {1},
     year = {1991},
     doi = {10.4064/ap-53-1-1-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-53-1-1-5/}
}