Article 50
1. For the admission to official listing of shares issued by companies which are nationals of another Member State and which shares have a physical form it is necessary and sufficient that their physical form comply with the standards laid down in that other Member State. Where the physical form does not conform to the standards in force in the Member State in which admission to official listing is applied for, the competent authorities of that state shall make that fact known to the public. 2. The physical form of shares issued by companies which are nationals of a non-member country must afford sufficient safeguard for the protection of the investors.