https://repositorio.upse.edu.ec/handle/46000/11565
https://repositorio.upse.edu.ec/handle/46000/11552
https://repositorio.upse.edu.ec/handle/46000/11568
https://repositorio.upse.edu.ec/handle/46000/11569
https://repositorio.upse.edu.ec/handle/46000/11576
https://repositorio.upse.edu.ec/handle/46000/11566
https://repositorio.upse.edu.ec/handle/46000/11563
https://repositorio.upse.edu.ec/handle/46000/11581
https://repositorio.upse.edu.ec/handle/46000/11586
https://repositorio.upse.edu.ec/handle/46000/11577
https://repositorio.upse.edu.ec/handle/46000/11587
https://repositorio.upse.edu.ec/handle/46000/11588