@article{AM2_1982__25_136961,
     author = {Dieter Jungnickel and Thomas Beth},
     title = {Variations on seven points: {An} introduction to the scope and methods of coding theory and finite geometries.},
     journal = {Aequationes mathematicae},
     pages = {153--176},
     publisher = {mathdoc},
     volume = {25},
     year = {1982},
     zbl = {0546.05001},
     url = {http://geodesic.mathdoc.fr/item/AM2_1982__25_136961/}
}