Artikel 4

1. As long as transfer of responsibility has not occurred in accordance with Article 2, paragraphs 1 and 2, the refugee shall be readmitted to the territory of the first State at any time, even after the expiry of the travel document. In the latter case readmission shall occur on the simple request of the second State, on condition that the request is made during the six months following the expiry of the travel document.
2. If the authorities of the second State do not know the whereabouts of the refugee and for this reason are not able to make the request mentioned in paragraph 1 during the six months following the expiry of the travel document, that request must be made within the six months following the time at which the whereabouts of the refugee become known to the second State, but in no case later than two years after the expiry of the travel document.