1. Subramanian, A.Tata Institute of Fundamental Research Note, T.I.F.R., A.S.-2-72, April, 1972 (unpublished).
2. Grigorov, N. L., Gubin, Yu. V., Rapoport, I. D., Savenke, I. A., Yakovlev, B. M., Akimov, V. V. and Nesterov, V. E.12th International Conference on Cosmic Rays, Hobart, 1971,5, 1746.
3. Akimov, V. V., Grigorov, N. L., Nesterov, V. E., Rapoport, I. D., Savenko, I. A., Skuridin, G. A. and Titenkov, A. F.Proc. of the 11th Int. Conf. on Cosmic Rays, Budapest, 1969; published inActa Physica Academiae Scientiarum Hungaricae, 1970,29, Suppl. 1, 517.
4. Grigorov, N. L., Rapoport, I. D., Savenko, I. A., Nesterov, V. E. and Prokhin, V. L.12th Int. Conf. on Cosmic Rays, Hobart, 1971,5, 1760.
5. Ashley, G. K., Keuffel, J. W. and Larson, M. O.Ibid., 1971,4, 1359.