Many natural systems’ fractal behaviour is, however, described by more than one fractal exponents. These are estimated by a multifractal analysis that estimates the Hölder exponents. Papasimakis, N., Pallikari, F. (2006). Markov Memory in Multifractal Natural Processes. Fractal 2006. In Complexus Mundi. Emergent Patterns in Nature, Miroslav N. Novak (editor). World Scientific Publishing Co. 53-62.