1. Bialas A. et al., Phys. Lett.51 B (1974), 179;Fishbane P. G. et al., Phys. Lett.51 B (1974), 139;Subramanium A., Proc. of Seminar of Interaction of Elementary Particles with Nuclei, Santiniketan, March 1976;Azimov A. A. et al., Proc. of Meeting on Nuclear Production at Very High Energies, Trieste, June 1976;Anderson B., Proc. of the VIIth International Colloquium on Multiparticle Reaction, Tutzing, June 1976.
2. Meyer H., et al., Nuovo Cim.28 (1963), 1399;Winseler H., Nucl. Phys.69 (1965), 661;Friedlander E. M.,Friedman A., Nuovo Cim.52 (1967), 912;Martin J. W. et al., 13th Int. Conf. on Cosmic Rays, Desi 1973.
3. Daftari I. K. et al.; Fortschr. Phys.26 (1978), 609.
4. Ghosh D. C. et al., Acta Phys. Austriaca46 (1977), 97.
5. Ghosh D. C. et al., Phys. Rev. D19 (1979), 391.