• https://repositorio.uancv.edu.pe/items/e5cee39a-b1fc-40c1-a448-3f8332512bc4
• https://repositorio.uancv.edu.pe/items/abf51cdc-e0c3-46e1-822e-998797df85a1
• https://repositorio.uancv.edu.pe/items/3ccb0045-03f2-4ac0-bd89-5cf2e06e5fbf
• https://repositorio.uancv.edu.pe/items/7de9ae4e-01bb-4850-93b3-53997f92afcb