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2. Flux and spectrum of charged particles in the lower Van Allen belt;Armstrong;Bull. Am. Phys. Soc.,1961
3. Observations of the Van Allen radiation regions during August and September 1959, 1;Arnoldy;J. Geophys. Research,1960
4. Fan , C. Y. P. Meyer J. A. Simpson Trapped and cosmic radiation measurements from Explorer VI Space Research: Proceedings of the First International Space Science Symposium 951 Amsterdam 1960
5. Fan , C. Y. P. Meyer J. A. Simpson Dynamics and structure of the outer radiation belt 61 34 Enrico Fermi Institute for Nuclear Studies, University of Chicago 1961