1. Proceedings of “The Universe viewed in Gamma Rays”;Lorenz,2002
2. J.A. Barrio et al., Design report on MAGIC MPI-PhE/98-5 (March 1998), p. 11–27 (see also http://hegra1.mppmu.mpg.de/MAGICWeb/)
3. Scarsi L. et al., EUSO – Report on the Phase A Study (see also http://aquila.lbl.gov/EUSO/)
4. M. Teshima et al., EUSO (The Extreme Universe Space Observatory)- Scientific Objectives Proceedings ICRC 2003, pp. 1069
5. Cosmic rays at ultra high energies (neutrino?)