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Published in 1999
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Published in 2005
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by Paucar, Betty; Gallegos, Patricio; Nieto C., Carlos; Córdova, Juan J.; Rodríguez I., Luis F.; Ochoa L., José; Williams, Roger
Published in 2000
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by Alwang, Jeffrey; Weller, Stephen C.; Sánchez, Guillermo E.; Calderón, Luis; Edwards, C. Richard; Hamilton, Sarah; Williams, Roger; Ellis, Mike; Suárez, Carmen; Barrera, Víctor Hugo; Crissman, Charles; Norton, George W.
Published in 2005
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by Ochoa L., José; Gallegos, Patricio; Asaquibay, César; Insuasti, María Luisa; Galarza, V.; Jaramillo, A.; Vizuete, B.; Viera, William; Viteri, J.; Williams, Roger; Carrasco, I.; Martínez, Aníbal; Ayala, G.
Published in 2001
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Published in 2001
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Published in 1999
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