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Supported by the joint program of the O.N.B. and the U.S.A.E.C.
On leave irom Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, Brazil.
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Palmeira, E.A.K., Williams, R.W. Rapid decrease of cosmic-ray intensity. Nuovo Cim 8, 352–355 (1958). https://doi.org/10.1007/BF02747751
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DOI: https://doi.org/10.1007/BF02747751