@article{ELMA_1988__43_3_141418,
     author = {J.E. Hofmann},
     title = {\"Uber {R\"osselringe} auf dem {Brett} von 6...2 {Zellen.}},
     journal = {Elemente der Mathematik},
     pages = {1--17},
     publisher = {mathdoc},
     volume = {43},
     number = {3},
     year = {1988},
     zbl = {0734.05011},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1988__43_3_141418/}
}