Notes

(1) W. Chen, in Proceedings of the International Symposium on Lepton and Photon Interactions at High Energies, Hamburg, 1977, edited by F. Gutbrod (DESY, Hamburg, 1977).

(2) B. Knapp et al., Phys. Rev. Lett. 37, 882 (1976).

(3) For a summary, see D. W. G. S. Leith, in Electromagnetic Interactions of Hadrons, edited by A. Donnachie and G. Shaw (Plenum, New York, 1977).

(4) D. O. Caldwell et al., Fermilab report (unpublished).

(5) See, for example, a discussion of the cosmic-ray charm candidates in T. K. Gaisser and F. Halzen, Phys. Rev. D 14, 3153 (1976).

(6) G. Coremans-Bertrand et al., Phys. Lett. 65B, 480 (1976).

(7) S. W. Herb et al., Phys. Rev. Lett. 39, 252 (1977).

(8) R. Cutler and D. Sivers, Phys. Rev. D 17, 196 (1978).

(9) B. L. Combridge, J. Kripfganz, and J. Ranft, Phys. Lett. 70B, 234 (1977).

(10) F. E. Close, D. M. Scott, and D. Sivers, Nucl. Phys. B117, 134, (1976).

(11) S. Okubo, Phys. Lett. 5, 160 (1963); G. Zweig, report, 1964 (unpublished); J. Iizuka, Prog. Theor. Phys. Suppl. 37-38, 21 (1966).

(12) D. Sivers, J. Townsend, and G. West, Phys. Rev. D 13, 1234 (1976).

(13) L. Jones and H. W. Wyld, Illinois report, 1977 (unpublished).

(14) R. Cutler and D. Sivers, Phys. Rev. D 16, 679 (1977).

(15) R. Blankenbeclerand and S. J. Brodsky, Phys. Rev. D 10, 2973 (1974).

(16) H. Abarbanel, S. Drell, and F. Gilman, Phys. Rev. 177, 2458 (1969); P. V. Landshoff, J. C. Polkinghome, and R. Short, Nucl. Phys. B28, 225 (1971).

(17) R. Field and R. Feynman, Phys. Rev. D 15, 2590 (1970).

(18) B. Knapp et al., Phys. Rev. Lett. 34, 1040 (1975).

(19) R. L. Anderson et al., Phys. Rev. Lett. 38, 263 (1977).

(20) M. A. Shifman, A. I. Vainshtein, and V. I. Zakharov, Phys. Lett. 65B, 255 (1976).

(21) B. Margolis, Fermilab report, 1977 (unpublished).

(22) See, for example, the summary of G. Fox, Caltech report, 1977 (unpublished).

(23) L. Jones and H. W. Wyld, Phys. Rev. D 17, 759 (1978).

(24) H. Fritzsch, Phys. Lett. 67B, 217 (1977).

(25) D. Sivers, Nucl. Phys. B106, 95 (1976).

(26) M. Bourquin and J. M. Gaillard, Nucl. Phys. B114, 334 (1976).

(27) J. Kirby, invited talk presented at the International Symposium on Proton and Lepton Interactions at High Energies, Hamburg, 1977 (unpublished).

(28) M. Gronau, C. H. Llewellyn Smith, T. F. Walsh, T. C. Yang, and S. Wolfram, Nucl. Phys. B 123, 47 (1977).

(29) T. Appelquist et al., Phys. Rev. Lett. 36, 76 (1976) erratum 1161 (1976); C. P. Korthals Altes and E. de Rafael, Phys. Lett. 62B, 320 (1976).

(30) J. M. Cornwall and G. Tiktopoulos, Phys. Rev. Lett. 35, 338 (1975); and Phys. Rev. D 13, 3370 (1976).

(31) G. Altarelli and G. Parisi, LPTENS Report No. 77/6, 1977 (unpublished).

(32) H. D. Politzer, Harvard report, 1977 (unpublished).

(33) See, for example, A. Buras and K. Gaemers, Nucl. Phys. B132, 249 (1978); M. Glück and E. Reya, Phys. Rev. D 16, 3242 (1977).

(34) D. H. Perkins, P. Schreiner, and W. G. Scott, Phys. Lett. 67B, 347 (1977).

(35) F. Halzen, Rutherford report, 1977 (unpublished); Phys. Lett. B69, 105 (1977).

(36) M. B. Einhorn and S. Ellis, Phys. Rev. D 12, 2007 (1975).

(37) See, for example, the discussion in D. Sivers, S. J. Brodsky, and R. Blankenbecler, Phys. Rep. 23C, 1 (1976).

(38) See, for example, M. Glück, J. F. Owens, and E. Reya, Phys. Rev. D 17, 2324 (1978) and references therein.

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