Karnabos, Dimitris, Roido Mitoula, Alexandra Tragaki, and Constantinos Apostolopoulos. “A Review of Green Public Procurement in the EU”. European Journal of Applied Sciences 10, no. 5 (September 22, 2022): 122–128. Accessed May 30, 2026. https://scholarpublishing.org/journals/index.php/EJAS/article/view/8416.