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El-Borie, M. A. and Darwish, A. A. (2006) Periodicities in geomagnetic-activity indices and solar-wind parameters, and their possible solar origin. Il nuovo cimento C, 29 (5). pp. 539-552. ISSN 1826-9885
El-Borie, M. A. and Al-Thoyaib, S. S. (2002) North-South asymmetry of cosmic-ray density gradients throughout the epoch 1955-1991. Il nuovo cimento C, 25 (3). pp. 353-368. ISSN 1826-9885