@article{AMI_1999_26_a6,
     author = {Tibor Farkas},
     title = {On the associativity of algorithms},
     journal = {Annales mathematicae et informaticae},
     pages = {39--47},
     year = {1999},
     volume = {26},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AMI_1999_26_a6/}
}