http://www.google.fr/#output=search&sclient=psy-ab&q=fractale+4d&oq=fractale+4d&gs_l=hp.3...500.4595.1.4705.15.11.4.0.0.0.83.802.11.11.0.ernk_timepromotiona..0.0...1.1.16.hp.OryHTvl5JZI&psj=1&bav=on.2,or.r_qf.&bvm=bv.47534661,d.d2k&fp=e8b4aec97afcc20c&biw=1362&bih=645

http://images.math.cnrs.fr/L-art-de-Francesco-Mai.html

http://www.iquilezles.org/www/articles/budhabrot/budhabrot.htm