1. R. Glasstetter, KASCADE Collaboration, Proceedings of the 25th International Cosmic Ray Conference, Durban, contribution HE 2.1.5, 1997
2. A Study of Nuclear Active Particles in Extensive Air Shower
3. J.R. Hörandel et al., KASCADE Collaboration, Proceedings of the 26th International Cosmic Ray Conference, Salt Lake City, contribution HE 2.2.41, 1999