@article{TAC_2012_27_a5,
     author = {Marino Gran and Zurab Janelidze and Diana Rodelo and Aldo Ursini},
     title = {Symmetry of regular diamonds, the {Goursat} property, and subtractivity},
     journal = {Theory and applications of categories},
     pages = {80--96},
     publisher = {mathdoc},
     volume = {27},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2012_27_a5/}
}