Dia 1 Stiinta si Tehnica 11-1983 pag 45
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Dia 3 Stiinta si Tehnica 11-1983 pag 45
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Dia 8 Stiinta si Tehnica 11-1983 pag 45
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Dia 9 Stiinta si Tehnica 11-1983 pag 45
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Dia 11 Stiinta si Tehnica 11-1983 pag 45
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