• https://repository.upb.edu.co/handle/20.500.11912/12211
• https://repository.upb.edu.co/handle/20.500.11912/8029
• https://repository.upb.edu.co/handle/20.500.11912/2686
• https://repository.upb.edu.co/handle/20.500.11912/1825
• https://repository.upb.edu.co/handle/20.500.11912/11960
• https://repository.upb.edu.co/handle/20.500.11912/10404
• https://repository.upb.edu.co/handle/20.500.11912/9008
• https://repository.upb.edu.co/handle/20.500.11912/1681
• https://repository.upb.edu.co/handle/20.500.11912/8953
• https://repository.upb.edu.co/handle/20.500.11912/4018
• https://repository.upb.edu.co/handle/20.500.11912/7020