[1] N. Hodgson, D. Dudly, L. Gruber, et al., in Technical Digest of CLEO'2001 CThC4, p. 389.
[2] S. Konno, T. Kojima, S. Fujikawa, et al., in Technical Digest of CLEO'2001 CThC6, p. 391.
[3] F. Z. Zhou, M. Maikowski, and Q. Fu, in Technical Digest of CLEO'98 CFL4, p. 542.
[4] A. B. Petersen and W. L. Nighan, in Technical Digest of CLEO'98 CFL5, p. 542.