Summers, D., Shi, R., Engebretson, M. J., Oksavik, K., Manweiler, J. W., & Mitchell, D. G. (2017), Energetic proton spectra measured by the Van Allen Probes, J. Geophys. Res.: Space Phys., 122, doi.org/10.1002/2017JA024484 (pdf)
Summers, D., Shi, R., Engebretson, M. J., Oksavik, K., Manweiler, J. W., & Mitchell, D. G. (2017), Energetic proton spectra measured by the Van Allen Probes, J. Geophys. Res.: Space Phys., 122, doi.org/10.1002/2017JA024484 (pdf)