@article{AM2_1975__12_136513,
     author = {M.A. Taylor},
     title = {R-and {T-Groupoids:} {A} {Generalization} of {Groups.}},
     journal = {Aequationes mathematicae},
     pages = {242--248},
     publisher = {mathdoc},
     volume = {12},
     year = {1975},
     url = {http://geodesic.mathdoc.fr/item/AM2_1975__12_136513/}
}