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3. If, in particular cases, it is impossible for Bulgaria to make restitution of objects of artistic, historic or archaeological value, belonging to the cultural heritage of the United Nation from whose territory such objects were removed by force or duress by Bulgarian forces, authorities or nationals, Bulgaria shall transfer to the United Nation concerned objects of the same kind as, and of approximately equivalent value to, the objects removed, in so far as such objects are obtainable in Bulgaria. 4. The Bulgarian Government shall return the property referred to in this Article in good order and, in this connection, shall bear all costs in Bulgaria relating to labour, materials and transport. 5. The Bulgarian Government shall co-operate with the United Nations in, and shall provide at its own expense all necessary facilities for, the search for and restitution of property liable to restitution under this Article. 6. The Bulgarian Government shall take the necessary measures to effect the return of property covered by this Article held in any third country by persons subject to Bulgarian jurisdiction. 7. Claims for the restitution of property shall be presented to the Bulgarian Government by the Government of the country from whose territory the property was removed, it being understood that rolling stock shall be regarded as having been removed from the territory to which it originally belonged. The period during which such claims may be presented shall be six months from the coming into force of the present Treaty. 8. The burden of identifying the property and of proving ownership shall rest on the claimant Government, and the burden of proving that the property was not removed by force or duress shall rest on the Bulgarian Government. PART VI. ECONOMIC CLAUSES ARTICLE 23 i. In so far as Bulgaria has not already done so, Bulgaria shall restore all legal rights and interests in Bulgaria of the United Nations and their nationals as they existed on April 24, 1941, and shall return all property in Bulgaria of the United Nations and their nationals as it now exists. 2. The Bulgarian Government undertakes that all property, rights and interests passing under this Article shall be restored free of all encumbrances and charges of any kind to which they may have become subject as a result of the war and without the imposition of any charges by the Bulgarian Government in connection with their return. The Bulgarian Government shall nullify all measures, including seizures, sequestration or control, taken by it against United Nations property between April 24, 1941, and the coming into force of the present Treaty. In cases where the property has not been returned within six months from the coming into force of the present Treaty, application shall be made to the Bulgarian authorities not later than twelve months from the coming into force of the Treaty, except in cases in which the claimant is able to show that he could not file his application within this period. 3. The Bulgarian Government shall invalidate transfers involving property, rights and interests of any description belonging to United Nations nationals where such transfers resulted from force or duress exerted by Axis Governments or their agencies during the war. 4. — (a) The Bulgarian Government shall be responsible for the restoration to complete good order of the property returned to United Nations nationals under paragraph lof this Article. In cases where property cannot be returned or where, as a result of the war, a United Nations national has suffered a loss by reason of injury or damage to property in Bulgaria, he shall receive from