• https://repositorio-aberto.up.pt/handle/10216/176952
• https://repositorio-aberto.up.pt/handle/10216/176953
• https://repositorio-aberto.up.pt/handle/10216/154576
• https://repositorio-aberto.up.pt/handle/10216/176919
• https://repositorio-aberto.up.pt/handle/10216/173499
• https://repositorio-aberto.up.pt/handle/10216/176954
• https://repositorio-aberto.up.pt/handle/10216/164343
• https://repositorio-aberto.up.pt/handle/10216/176955