T. M. Yan, ; ; .

K. Heikkilä, N. A. Törnqvist, and S. Ono, .

H. Grotch, X. Zhang, and K. J. Sebastian, .

R. McClary and N. Byers, .

F. A. Harris, hep-ex/9903036 [@psip].

P. G. O. Freund and Y. Nambu, ; W.-S. Hou and A. Soni, .

Y. F. Gu and X. H. Li, .

J. Thaler, private communication.

Lead-glass Wall , I. Peruzzi , ; D. L. Scharre , : $\sigma(\ppp) = 10.3 \pm 1.6$ nb.

R. Partridge, Ph. D. thesis, California Institute of Technology, report CALT-68-1150, 1974 (unpublished), based on Crystal Ball data: $\sigma(\ppp) = 6.7 \pm 0.9$ nb.

Mark II , R. H. Schindler , : $\sigma(\ppp) = 9.3 \pm 1.4$ nb.

BES , J. Z. Bai , report hep-ex/0102003, submitted to Phys. Rev. Lett.: $\sigma(\ppp) = 8.7 \pm 2.5$ nb (my estimate).

CLEO , T. E. Coan , .

A. Lenz, talk given at UK Phenomenology Workshop on Heavy Flavor and CP Violation, Durham, England, 17-22 Sept. 2000, preprint hep-ph/0011258.

SLD , presented by A. S. Chou at Division of Particles and Fields Meeting, American Physical Society, Columbus, Ohio, August 2000, SLAC report SLAC-PUB-8686; presented by C. S. Lin at 36th Rencontres de Moriond 