@article{AM2_1978__18_136786,
     author = {Ronald D. Baker},
     title = {Quasigroups and tactical systems.},
     journal = {Aequationes mathematicae},
     pages = {296--303},
     year = {1978},
     volume = {18},
     zbl = {0393.05017},
     url = {http://geodesic.mathdoc.fr/item/AM2_1978__18_136786/}
}