@article{AM2_1971__7_136268,
     author = {N.S. MENDELSOHN and D.M. JOHNSON},
     title = {Extended {Triple} {Systems} {(Short} {Communication)}},
     journal = {Aequationes mathematicae},
     pages = {326--326},
     publisher = {mathdoc},
     volume = {7},
     year = {1971},
     url = {http://geodesic.mathdoc.fr/item/AM2_1971__7_136268/}
}