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https://revistas.ups.edu.ec/index.php/sophia/article/view/28.2020.07/3633.  , 2020

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http://dspace.ups.edu.ec/handle/123456789/18282.  , 2020

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https://retos.ups.edu.ec/index.php/granja/issue/current/index.php/retos/article/view/17.2019.03/3234/index.php/retos/user/setLocale/es_ES/index.php/index/index.php/retos/announcement/index.php/retos/article/view/17.2019.09/3247/index.php/retos/article/view/17.2019.05/3202/index.php/retos/article/view/17.2019./index.php/sophia/article/view/3234.  , 2020