• https://dspace.epau.edu.dz/items/c5d68d5f-3539-4332-bf8f-9131a6af81ee
• https://dspace.epau.edu.dz/items/96a2bf74-2921-4e6a-8a04-b821a6392648
• https://dspace.epau.edu.dz/items/2993c945-8b2d-43a9-abd6-55a5c7bf8fd5
• https://dspace.epau.edu.dz/items/25a1bc97-67e1-452c-8c1b-ed7697971fa4
• https://dspace.epau.edu.dz/items/c1e46ed1-03de-4f7c-859a-9260a4f4eaac