1. (TPC/2γ Collaboration) H.Aihara et al., Phys.Rev.Lett. 57 (1986) 2500.
2. (Mark II Collaboration) G.Gidal et al., Phys.Rev.Lett. 59 (1987) 2016.
3. (JADE Collaboration) Contributed paper to this conference. Also talk presented by P.Hill in Proc. of the Int. Europhysics Conf. on High Energy Phys., Uppsala, Sweden 25 june - 1 july 1987.
4. (CELLO Collaboration) Contributed paper 535 to this conference.
5. R.N.Cahn, Phys.Rev. D35 (1987) 3342.