1
2
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5
Published in 1988
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6
7
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9
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16
Published in 1999
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17
by Caviedes C., Mario; Yánez G., Carlos; Silva, Edison; Dobronsky, Jorge; Caicedo, Marlon; Zambrano Mendoza, José Luis; Heredia, Jorge
Published in 2002
Repository
18
19
Published in 1986
Repository
20
Published in 1997
Repository