Long-Range Correlations in the Fossil Record and the Fractal Nature of Macroevolution. - Ricard V. Solé; Susanna C. Manrubia; Juan Pérez-Mercader; Michael Benton; Per Bak (Adv. Complex Syst., 1998)

Multifractals and 1f noise by Benoit B. Mandelbrot. - Per Bak (Complex., 2000)