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I. Muñoz Canessa, P. Contreras Valenzuela, I. Cáceres Pavés, P. Sanchéz Peña, and E. Cáceres Rojas, “Engagement to its school tasks of the eighth grade of elementary. Talca, Chile”, Convergencia Educativa, no. 10-extra, pp. 51-73, Dec. 2021.