• https://repositorio.up.edu.pe/item/1151c88c-fcc7-4fc9-b2af-09ff29a636e8
• https://repositorio.up.edu.pe/item/13b15750-e332-41ca-8610-f9dad1932d5c
• https://repositorio.up.edu.pe/item/6685d831-f650-43c1-8985-9c3399a31891
• https://repositorio.up.edu.pe/item/741de4d8-4b1b-44dd-8e55-675bfcfed0b0
• https://repositorio.up.edu.pe/item/3e851ff3-3dd0-4119-a61c-448566330ed2
• https://repositorio.up.edu.pe/item/69e084cf-8091-404b-bce2-35c304c9f67a
• https://repositorio.up.edu.pe/item/26a5f5e7-e7ad-48bf-9a97-90e9b2570073
• https://repositorio.up.edu.pe/item/aea4cbdd-1ea7-4426-924a-c3a344e59361