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Published in 1986
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Published in 2008
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Published in 1983
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Published in 2018
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by Cuesta Subía, Hugo Xavier; Monteros J., Cecilia; Montesdeoca, Fabián; Unda Galarza, José Reinaldo; Carrera, Efrén; Yumisaca, Fausto; Reinoso R., Iván A.; Yánez Navarrete, Zoila Elizabeth
Published in 2011
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