1. J. Wdowczyk andA. W. Wolfendale:Proceedings of the Madison Workshop, 10–12 December 1981.
2. J. Wdowczyk andA. W. Wolfendale:Nuovo Cimento A,54, 433 (1979).
3. J. Gawin, J. Wdowczyk andR. Maze:Proceedings of the XII Interamerican Seminar on Cosmic Rays, La Paz 1970 (University of San Andres), Vol.3, p. 723.
4. J. Wdowczyk andE. Zujewska:J. Phys. A,5, 1514 (1972).
5. J. N. Capdevielle, B. Grochalska andJ. Wdowczyk:XVII International Cosmic Ray Conference, Paris, Vol.5 (1981), p. 28.