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Published in Scopus, in 1990, in volume 14, pages 29-30
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Published in Scopus, in 1990, in volume 14, pages 30
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Published in Scopus, in 1990, in volume 14, pages 31
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Published in Scopus, in 1990, in volume 14, pages 32-33
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Published in Scopus, in 1990, in volume 14, pages 33
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Published in Scopus, in 1990, in volume 14, pages 34-35
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