Badis, M., I. Benchana, and N. Hamdi. “Coexistence Between Primary and Secondary Cavity-Nesting Birds in Chelia-Ouled Yagoub National Park of Algeria”. Algerian Journal of Biosciences, vol. 4, no. 2, Dec. 2023, pp. 109-15, https://journal.univ-eloued.dz/index.php/ajb/article/view/144.