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Published in 2007
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Published in 2003
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Published in 1998
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by Cuesta Subía, Hugo Xavier; Rivadeneira Ruales, Jorge Esteban; Carrera, Efrén; Cueva, M.; Zumba, M.; Yánez Navarrete, Zoila Elizabeth; Villacrés, Elena; Monteros J., Cecilia; Reinoso R., Iván A.
Published in 2008
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