Intertwining based on the geometry of the Bonan-Jeener's triple Klein bottle [Entrelacs bases sur la géométrie de la triple bouteille de Bonan-Jeener-Klein].
See the Bonan-Jeener's triple Klein bottle:
(this picture was created on 12/29/2005)
(this page -belonging to the CMAP28 site- was last updated on 03/09/2010 19:59:44 -CET-)