2
Published in 2016
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3
Published in 1998
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5
Published in 2009
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9
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11
Published in 1979
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14
Published in 2004
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20
by Valverde, Franklin; Torres, Cristhian; Rivadeneira Ruales, Jorge Esteban; Parra, Rafael; Cartagena Ayala, Yamil Everaldo; Alvarado Ochoa, Soraya Patricia
Published in 2010
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