https://repositorio.upn.edu.pe/items/e67fa786-6011-4901-84b0-1ca0742b991c
https://repositorio.upn.edu.pe/items/08ad59f6-e6d5-4d62-a418-ea1f42ca1782
https://repositorio.upn.edu.pe/items/e2e2fe7f-f815-41ef-9bc7-bafcd1595475
https://repositorio.upn.edu.pe/items/9607e8ca-0c2b-469d-b1d8-a7938f2967a1
https://repositorio.upn.edu.pe/items/2a9051df-50fb-471e-ae9a-8b01728a9b55
https://repositorio.upn.edu.pe/items/4afae249-df0c-4f78-a788-0ff2a50e665b
https://repositorio.upn.edu.pe/items/34d1d362-3db1-48bd-bbb4-5b070333c225
https://repositorio.upn.edu.pe/items/524f6ee4-e8b1-4912-b4ea-589b3f861ece
https://repositorio.upn.edu.pe/items/4a7b178f-39a1-427f-a3d7-d1b6b2663d5e