1. Catalogues of Highest Energy Cosmic Rays, No. 1: Wada, Ed. by V. Ranch and H. Park (World Data Center C2, Japan, 1980); No. 2: Sydney, Ed. by A. Inoue (World Data Center C2, Japan, 1986); No. 3: Yakutsk, Ed. by A. Inoue and Sakamoto (World Data Center C2, Japan, 1988).
2. N. Hayashida, K. Honda, N. Inoue, K. Kadota, F. Kakimoto, S. Kakizawa, K. Kamata, S. Kawaguchi, Y. Kawasaki, N. Kawasumi, E. Kusano, A. M. Mahrous, K. Mase, T. Minagawa, M. Nagano, D. Nishikawa, et al., Astron. J. 120, 2190 (2000).
3. E. G. Berezhko, Astrophys. J. 698, L138 (2009).
4. N. S. Erohin, S. S. Moiseev, and R. Z. Sagdeev, Sov. Astron. Lett. 15, 1 (1989).
5. G. I. Rubtsov and S. V. Troitsky, Priroda 6, 11 (2011).