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- [24] INTENSITY VARIATION OF VERTICAL COSMIC-RAY AIR SHOWERS PHYSICAL REVIEW, 1957, 106 (03): : 555 - 557
- [25] PENETRATING PARTICLES IN EXTENSIVE COSMIC-RAY AIR SHOWERS PHYSICAL REVIEW, 1949, 75 (07): : 1063 - 1071
- [26] THE DENSITY SPECTRUM AND STRUCTURE OF EXTENSIVE COSMIC-RAY AIR SHOWERS AT SEA LEVEL PROCEEDINGS OF THE PHYSICAL SOCIETY OF LONDON SECTION A, 1950, 63 (368): : 864 - 883
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