Takla, E. M., E. M., Yumoto, K., Cardinal, M. G., Abe, S., Fujimoto, A., Ikeda, A., Tokunaga, T., Yamazaki, Y., Uozumi, T., Mahrous, A., Ghamry, E., Mengistu, G., Afullo, T., Macamo, A., Joao, L., Mweene, H., Mwiinga, N., Uiso, C., Baki, P., Kianji, G., Badi, K., Sutcliffe, P., Palangio, P. (2011): A study of latitudinal dependence of Pc 3-4 amplitudes at 96˚ magnetic meridian stations in Africa. - Sun and Geosphere, 6, 2, 65-70.