1. Penna, T. J. P. (1995) J. Stat. Phys. 78: 1629.
2. Moss de Oliveira, S.; de Oliveira, P. M. C. and Stauffer, D. (1999) Evolution, Money, War and Computers. Teubner, Leipzig.
3. Moss de Oliveira, S.; de Oliveira, P. M. C. and Stauffer, D. (1996) Braz. J. Phys. 26: 626; Penna, T. J. P. and Wolf, D. E. (1997) Theory in Biosciences 116: 118; Schneider, J.; Cebrat, S. and Stauffer, D. (1998) Int. J. Mod. Phys. C 9: 721.
4. Stauffer, D. and Klotz, T. (2001) preprint for The Aging Male.
5. Klotz, T. (1998) “Der frühe Tod des starken Geschlechts”, Cuvillier, Göttingen; Klotz, T. and Hurrelmann, K. (1998) The Aging Male 1: 20; See also Baulieu, E. E. (1999) La Recherche 322: 72.