1
Published in 2003
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2
Published in 2003
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3
4
Published in 1986
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5
Published in 1988
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6
Published in 1978
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7
by Caviedes C., Mario; Yánez G., Carlos; Silva, Edison; Dobronsky, Jorge; Caicedo, Marlon; Zambrano Mendoza, José Luis; Heredia, Jorge
Published in 2002
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8
9
10
Published in 1989
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11
Published in 1987
Repository
12
Published in 2003
Repository
13
14
Published in 1988
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15
Published in 1984
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16
17
18
19
20
Published in 1999
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