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BECKER G, 1973, PTB-MITT, V83, P319
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BECKER G, 1974, JB DEUTSCHE GES CHRO, V25
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BECKER G, 1976, KLEINHEUBACHER BERIC, V19, P305
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BECKER G, 1969, PTB-MITT, V79, P77
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BECKER G, 1969, P INT C CHRONOM