F. Vallianatos, J. P. Makris, V. Saltas, L. Telesca, and V. Lapenna, “MONOFRACTAL AND MULTIFRACTAL ANALYSIS IN SHORT - TERM TIME DYNAMICS OF ULF GEOMAGNETIC FIELD MEASURED IN CRETE, GREECE”, geosociety, vol. 36, no. 3, pp. 1298–1307, Jan. 2004.