(352) يؤكد بيير-هنري أمبير أن الأمر يتعلق “بأفضل مثال” لهذا الصنف من الشروط التي تسمح“للدول بالقيام بخيار في اتجاه التقييد” (Les réserves aux traités multilateraux, Pedone, Paris, 1979, p. 172 )؛ وانظر أيضا: Frank Horn, Reservations and Interpretative Declarations to Multilateral Treaties, Swedish Institute of International Law, n. 5, Tobias Michael Carel, Asser Instituut, The Hague, 1988, p.
Pierre-Henri Imbert stresses that this is the best example of the type of clause allowing States to make a choice in the restrictive sense (Les réserves aux traités multilatéraux, Pedone, Paris, 1979, p. 172); see also Frank Horn, Reservations and Interpretative Declarations to Multilateral Treaties, Swedish Institute of International Law, Studies in International Law, No. 5, T. M. C. Asser Instituut, The Hague, 1988, p. 134.