Published in Phegea, in 1989, in volume 17, issue 1, pages 1-18
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Published in Phegea, in 1989, in volume 17, issue 1, pages 19-25
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Published in Phegea, in 1989, in volume 17, issue 1, pages 31-33
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Published in Phegea, in 1989, in volume 17, issue 1, pages 35-42
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Published in Phegea, in 1989, in volume 17, issue 2, pages 49-52
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Published in Phegea, in 1989, in volume 17, issue 2, pages 53-54
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Published in Phegea, in 1989, in volume 17, issue 2, pages 55-56
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Published in Phegea, in 1989, in volume 17, issue 2, pages 57-60
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Published in Phegea, in 1989, in volume 17, issue 2, pages 67-73
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Published in Phegea, in 1989, in volume 17, issue 2, pages 82
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Published in Phegea, in 1989, in volume 17, issue 2, pages 83-90
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Published in Phegea, in 1989, in volume 17, issue 3, pages 93-102
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Published in Phegea, in 1989, in volume 17, issue 3, pages 103
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Published in Phegea, in 1989, in volume 17, issue 3, pages 105-106
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Published in Phegea, in 1989, in volume 17, issue 3, pages 107-117
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Published in Phegea, in 1989, in volume 17, issue 3, pages 117-118
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Published in Phegea, in 1989, in volume 17, issue 3, pages 119-121
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Published in Phegea, in 1989, in volume 17, issue 3, pages 123-135
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Published in Phegea, in 1989, in volume 17, issue 4, pages 137-143
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Published in Phegea, in 1989, in volume 17, issue 4, pages 143
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Published in Phegea, in 1989, in volume 17, issue 4, pages 161-164
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Published in Phegea, in 1989, in volume 17, issue 4, pages 165-167
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Published in Phegea, in 1989, in volume 17, issue 4, pages 169-221
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