Dr. A. Verdross, le Keywords: Aliens | International law | Mots clefs: Etrangers | Droit international | ABSTRACT After a presentation of the sources and the system of the international law of foreigners, the author examines the issue of the entry of foreigners. The author then presents the general rules on the treatment of foreigners who have entered the territory of the State, and analyzes the special rules on the treatment of foreigners in the economic field. Après une présentation des sources et du système du droit international des étrangers, l'auteur étudie la ques…