Published in Scopus, in 1998, in volume 20, pages 1-18
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Published in Scopus, in 1998, in volume 20, pages 48-51
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Published in Scopus, in 1998, in volume 20, pages 57
Published in Scopus, in 1998, in volume 20, pages 58-60
Published in Scopus, in 1998, in volume 20, pages 60-62