SCHULZ, Erhard, et al. “DRUGS, FLIGHT, AND MIGRATION. A COMPARISON OF NORTH AND WEST AFRICA, NEAR EAST AND EUROPE”. Studia Universitatis Babeș-Bolyai Geographia, vol. 65, no. 1-2, Dec. 2020, pp. 9-39, doi:10.24193/subbgeogr.2020.01.