@article{VM_2002_4_2_a0,
     author = {Paulus Gerdes},
     title = {Cylinder matrices},
     journal = {Visual Mathematics},
     publisher = {mathdoc},
     volume = {4},
     number = {2},
     year = {2002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/VM_2002_4_2_a0/}
}