• https://digital.unam.edu.na/xmlui/handle/11070.1/21236
• https://digital.unam.edu.na/xmlui/handle/11070.1/21237
• https://digital.unam.edu.na/xmlui/handle/11070.1/21238
• https://digital.unam.edu.na/xmlui/handle/11070.1/21239
• https://digital.unam.edu.na/xmlui/handle/11070.1/21240
• https://digital.unam.edu.na/xmlui/handle/11070.1/21241
• https://digital.unam.edu.na/xmlui/handle/11070.1/21243
• https://digital.unam.edu.na/xmlui/handle/11070.1/21244
• https://digital.unam.edu.na/xmlui/handle/11070.1/21245