• https://repositorio.upse.edu.ec/handle/46000/12397
• https://repositorio.upse.edu.ec/handle/46000/12398
• https://repositorio.upse.edu.ec/handle/46000/12394
• https://repositorio.upse.edu.ec/handle/46000/12401
• https://repositorio.upse.edu.ec/handle/46000/12399
• https://repositorio.upse.edu.ec/handle/46000/12400
• https://repositorio.upse.edu.ec/handle/46000/12402
• https://repositorio.upse.edu.ec/handle/46000/12405
• https://repositorio.upse.edu.ec/handle/46000/12404
• https://repositorio.upse.edu.ec/handle/46000/12403