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2. W. Brand, Der Kugelblitz. Probleme Der Kosmischen Physik (H. Grand, Hamburg, 1923).
3. R. A. Leonov, The Mystery of Ball Lightning (Nauka, Moscow, 1965).
4. I. M. Imyanitov and D. Ya. Tikhii, Beyond the Law (Gidrometeoizdat, Leningrad, 1967).
5. S. Singer, The Nature of Ball Lightning (Springer, New York, 1971).