@article{VM_2002_4_3_a0,
     author = {Corinne Cerf},
     title = {A {Family} of {Impossible} {Figures} {Studied} by {Knot} {Theory}},
     journal = {Visual Mathematics},
     publisher = {mathdoc},
     volume = {4},
     number = {3},
     year = {2002},
     url = {http://geodesic.mathdoc.fr/item/VM_2002_4_3_a0/}
}