Intertwining based on the geometry of the Bonan-Jeener-Klein triple bottle [Entrelacs basés sur la géométrie de la triple bouteille de Bonan-Jeener-Klein].
See the Bonan-Jeener's triple Klein bottle:
(CMAP28 WWW site: this page was created on 12/29/2005 and last updated on 02/19/2020 15:19:30 -CET-)