@article{AM2_1978__18_136787,
     author = {J. Barnhardt},
     title = {Distributive groupoids and biassociativity.},
     journal = {Aequationes mathematicae},
     pages = {304--321},
     publisher = {mathdoc},
     volume = {18},
     year = {1978},
     zbl = {0418.22002},
     url = {http://geodesic.mathdoc.fr/item/AM2_1978__18_136787/}
}