@article{CMUC_1980__21_3_a6,
     author = {Kepka, Tom\'a\v{s}},
     title = {A note on associative triples of elements in cancellation groupoids},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {479--487},
     publisher = {mathdoc},
     volume = {21},
     number = {3},
     year = {1980},
     mrnumber = {590128},
     zbl = {0444.20069},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1980__21_3_a6/}
}