@article{VM_2002_4_3_a2,
     author = {Paulus Gerdes},
     title = {Twill-plaited {Octagonal} {Designs}},
     journal = {Visual Mathematics},
     publisher = {mathdoc},
     volume = {4},
     number = {3},
     year = {2002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/VM_2002_4_3_a2/}
}