Artikel 26

1. The application of the provisions of Articles 20, 21, 23 and 24 as between two or more Contracting Parties shall be subject to the conclusion between those Parties of bilateral or multilateral agreements which may also contain appropriate special arrangements.
2. The agreements referred to in the preceding paragraph shall specify in particular:
(a) the categories of persons to whom the provisions of Article 20, 21, 23 and 24 shall apply;
(b) the period during which benefits in kind may be provided by the institution of one Contracting Party, the cost being borne by the institution of another Contracting Party;
(c) the special conditions governing the supply of prosthetic appliances, major aids and other major benefits in kind;
(d) rules to prevent the overlapping of benefits of the same kind;
(e) arrangements for the refund of benefits provided by the institution of one Contracting Party the cost being borne by the institution of another Contracting Party.
3. Two or more Contracting Parties may agree that there shall be no refunds between the institutions in their jurisdiction.