[[IX-5]] Denver Post, Nov. 6, 1957.
[[IX-6]] Viemeister, P. E. The Lightning Book. Garden City, N.Y.: Doubleday & Co., 1961.
[[IX-7]] Matthias, B. T., and Buchsbaum, S. J. “Pinched Lightning,” Nature, Vol. 194 (1962), p. 327.
[[IX-8]] Ritchie, D. J. Ball Lightning. A Collection of Soviet Research in English Translation (1961). New York: Consultants Bureau.
[[IX-8a]] Cade, C. M. “Thunderbolts as the X-weapon,” Discovery, Vol. XXIII (1962), pp. 23–28.
[[IX-9]] Kapitsa, P. L. “The Nature of Ball Lightning,” Dokl. Akad. Nauk SSSR, Vol. CI, No. 2 (1955), pp. 245–48. (Translated in [IX-8].)
[[IX-10]] Hill, E. L. “Ball Lightning as a Physical Phenomenon,” Bulletin American Meteorology Society, Vol. XXXXI (1960), p. 199.
[[IX-11]] Pierce, E. T.; Nadile, R. M.; and McKinnon, P. J. “An Experimental Investigation of Negative Point-plane Corona and Its Relation to Ball Lightning,” AFCRL-TR-60-354. Bedford, Mass.: Oct. 24, 1960.
[[IX-12]] Gold, E. “Thunderbolts: The Electric Phenomena of Thunderstorms,” Nature, Vol. CLXIX (1952), pp. 561–63.
[[IX-13]] Kogan-Beletskii, G. I. “The Nature of Ball Lightning,” Priroda, No. 4 (1957), pp. 71–73. (Translated in [IX-8].)