• https://repositorio.unu.edu.pe/items/b6178e56-d9e1-4fd7-8cb2-d53308df62f8
• https://repositorio.unu.edu.pe/items/a05befc7-bc40-4a83-b904-d8dcd4a7c2fb
• https://repositorio.unu.edu.pe/items/34ac4664-2818-43bd-b931-70f1282ce414
• https://repositorio.unu.edu.pe/items/6f870708-ef11-408e-bffb-8abaafe6706a
• https://repositorio.unu.edu.pe/items/4bffa5f1-5333-41ff-b584-1348309ab4bf