• https://repositorio.uasb.edu.bo/items/7c4c5148-a8b6-47d1-8a8d-6f69be16caf9
• https://repositorio.uasb.edu.bo/items/66d787f6-e835-46ef-81f2-17ff7b1f17f5
• https://repositorio.uasb.edu.bo/items/83191cc2-8bbb-4fe0-b069-9633fc02d74a
• https://repositorio.uasb.edu.bo/items/dfd213e7-4fcb-4d6a-88d4-14b805bfcc72
• https://repositorio.uasb.edu.bo/items/ad949ca1-e401-4d2c-b37f-81eefea29606