1. Proceedings of the 1976 DUMAND Summer Workshop,1976
2. P. F. Smith at Texas/ESO-CERN Symposium on Relativistic Astrophysics, Brighton, England, 12/90, Barrow, Mestel and Thomas, eds., Annals of the New York Academy of Sciences, 647, 425.
3. DUMAND '76;Tammann,1976
4. Astrophysics of Cosmic Rays;Berezinski,1990