1. Development and properties of positive lightning flashes at Mount San Salvadore;Berger,1975
2. The Earth flash;Berger,1977
3. Blitzstrom-Parameter yon Aufwartsblitzen;Berger;Bull. Schweiz. Electrotech. Ver.,1978
4. The mechanism of the long spark formation;Gallimberti;J. Phys., C,1979
5. Lightning to the Empire State Building;Hagenguth;Trans. Am. Inst. Electr. Eng., Part. 3,1952