B 128.5073a/ e Rules regulations listi?ß. -Ruies and regulations ror offic1al listing and trading of securities on the Vienna Stock Exchange. Ed. 1976. -Wien: Vsrl. d. Wiener Börsekammer 1983. 10 S. 8 (Normen u. Usancen d. Wiener Börse. 3a,e.)