1. Private communication from P. Roudeau (DELPHI Collaboration)
2. CUSB collaboration, presented by M. Tuts: Int. Europhysics Conf. on High energy physics, Madrid (September 6–13, 1989)
3. Review of Particle Properties: Phys. Lett. 204 (1988) 1
4. ARGUS collaboration, presented by J. Spengler, Int. Europhysics Conf. on High energy physics, Madrid (September 6–13, 1989)
5. Presented by R.J. Morrison (U.C. Santa Barbara), Int. Europhysics Conf. on High energy physics, Madrid (September 6–13, 1989)