@article{AM2_1979__19_136807,
     author = {Ki Hang Kim and Fred W. Roush},
     title = {A universal algebra approach to free projective planes.},
     journal = {Aequationes mathematicae},
     pages = {48--52},
     publisher = {mathdoc},
     volume = {19},
     year = {1979},
     zbl = {0413.51001},
     url = {http://geodesic.mathdoc.fr/item/AM2_1979__19_136807/}
}