M. L. Goldberger, Y. Nambu andR. Oehme:Ann. of Phys.,2, 226 (1957).
V. S. Barashenkov:Fortschr. Phys.,10, 205 (1962).
Riazuddin andM. J. Moravcsik:Phys. Lett.,4, 243 (1963).
I. I. Levintov:Phys. Lett.,7, 41 (1963).
P. Söding:Phys. Lett.,8, 285 (1964).
I. I. Levintov andG. M. Adelson-Velsky:Phys. Lett.,13, 185 (1964).
A. A. Carter andD. V. Bugg:Phys. Lett.,20, 203 (1966).
V. S. Barashenkov andV. D. Toneev: JINR preprint P2-3850 (1968).
G. Bialkowski andS. Pokorski:Nuovo Cimento,57 A, 219 (1968).
P. Pascual andF. J. Yndurain:Nuovo Cimento,61 A, 225 (1969).
O. V. Dombrajs:Yad. Fiz.,13, 1096 (1971).
O. V. Dumbrajs:Nucl. Phys.,46 B, 164 (1972).
P. Kroll:Lett. Nuovo Cimento,7, 745 (1973).
P. Kroll:Nucl. Phys.,74 B, 157 (1974).
D. W. Joynson andW. von Schlippe:Nucl. Phys.,65 B, 333 (1973).
C. Bourrely andJ. Fischer:Nucl. Phys.,61 B, 513 (1973).
J. B. Bronzan, G. L. Kane andU. P. Sukhatme:Phys. Lett.,49 B, 279 (1974).
L. Pilachowski:Lett. Nuovo Cimento,10, 301 (1974).
V. A. Nikitin:Particles and Nuclei,1, 1 (1970).
M. G. Shafranova:Particles and Nuclei,5, 645 (1974).
O. V. Dumbrajs andM. Staszel: to be published inFortschr. Phys.
A. Kanazawa andM. Sugawara:Phys. Lett.,40 B, 265 (1972).
A. Kanazawa:Phys. Rev. D,7, 2626 (1973).
O. V. Dumbrajs, Kh. Chernev andZ. Zlatanov:Nucl. Phys.,69 B, 336 (1974).
Kh. Chernev, O. V. Dumbrajs andZ. Zlatanov: JINR Communications E2-8053 (1974).
