Space time physics and fractality : Festschrift in honour of Mohamed El Naschie on the occasion of his 60th birthday / Peter Weibel, Garnet Ord, Otto E. Rössler editors. - Wien : Springer, 2005. - XXII, 231 S. : Ill., graph. Darst. ISBN: 978-3-211-25210-9 Text engl.