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Limitations of the COS approximation as applied to the cosmic-ray anisotropyR. D. Zwickl, W. R. Webber|Nuclear Instruments and Methods|1976Cited by 18
Spectrum of mean free paths near Earth in the solar cosmic ray event of April 29, 1973I. D. Palmer, F. B. McDonald, R. D. Zwickl et al.|Journal of Geophysical Research Atmospheres|1978Cited by 11
The solar probe missionW. C. Feldman, R. D. Zwickl, P. J. Kellogg et al.|AIP conference proceedings|1990Cited by 6