International organizations — Regional organizations — Benelux Economic Union — Legal nature — Whether supranational body — Treaty instituting the Benelux Union, 1958, Article 15 — Policy regarding admission of aliens to Benelux countries — Implementation of policy by Member States — Whether acting on behalf of Benelux Economic Union — Convention on the Transfer of Control of Persons to the External Frontiers of Benelux Territory, 1960, Article 4

International organizations — Benelux Economic Union — Institutions — Benelux Court of Justice — Procedures for referral of matters concerning the Benelux Economic Union by national courts of Member States — Treaty concerning the Establishment and Statute of the Benelux Court of Justice, 1965, Article 6

Aliens — Admission — Right of entry — Application by father for entry visa enabling him to visit son lawfully settled in State — Well-founded suspicion that father would become illegal resident — Whether State entitled to refuse father’s application — Convention on the Transfer of Control of Persons to the External Frontiers of Benelux Territory, 1960, Article 4

Treaties — Interpretation — By municipal courts — Object and purpose of Treaty — Reference to explanatory commentary accompanying Treaty — Significance of statements made by Governments of contracting parties contemporaneous to ratification of Treaty — The law of the Benelux Economic Union and the law of the Netherlands