Laadel, N. et al. 2020. Contribution to the study of xylophagus insects and their role in the decline of Alep pine (Pinus halepensis mill.) in El Ouldja’s Megsem forest (Setif - Algeria). Journal of Drug Delivery and Therapeutics. 10, 5 (Sep. 2020), 105–107. DOI:https://doi.org/10.22270/jddt.v10i5.4385.