Regulation 13. Contracts awarded pursuant to international rules

(a) specific procedural rules pursuant to an international agreement or arrangement concluded between one or more Member States and one or more third countries;

(b) specific procedural rules pursuant to a concluded international agreement or arrangement relating to the stationing of troops and concerning the undertakings of a Member State or a third country;

(c) specific procedural rules of an international organisation purchasing for its purposes, or to contracts which must be awarded by a Member State in accordance with those rules.