a cura di M. Colacino e G. Giovanelli = edited by M. Colacino and G. Giovanelli ; [sponsored by Istituto di Fisica dell'Atmosfera, CNR, Roma]Italian Physical Societyc2000
by Girija Rajaram and B.M. ReddyIndian Institute of Geomagnetism (Dept. of Science and Technology, Govt. of India) and National Physical Laboratory (Council of Scientific and Industrial Research, Govt. of India)1993