Dia 2 Stiinta si Tehnica 11-1983 pag 46
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Dia 4 Stiinta si Tehnica 11-1983 pag 46
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Dia 5 Stiinta si Tehnica 11-1983 pag 46
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Dia 6 Stiinta si Tehnica 11-1983 pag 46
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Dia 10 Stiinta si Tehnica 11-1983 pag 46
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