• https://repositorio.usat.edu.pe/items/bf37e3d5-0add-4a73-b16e-c7ddf1e3c5a7
• https://repositorio.usat.edu.pe/items/73e40484-e93d-4b6d-9001-7176d554cdf8
• https://repositorio.usat.edu.pe/items/790c4fcc-f685-4875-be5e-79848f23929b
• https://repositorio.usat.edu.pe/items/cb869eed-1546-4a0f-bc07-ce5189ba5078