@article{SF_1974__6_133963,
     author = {J. Varlet},
     title = {On distributive residuated groupoids.},
     journal = {Semigroup forum},
     pages = {80--85},
     publisher = {mathdoc},
     volume = {6},
     year = {1974},
     zbl = {0256.06006},
     url = {http://geodesic.mathdoc.fr/item/SF_1974__6_133963/}
}