Lyons, L., & Thorne, R. (1973). Equilibrium Structure of Radiation Belt Electrons. Journal Of Geophysical Research, 78, 2142-2149. http://doi.org/10.1029/JA078i013p02142 (Original work published May 1973)
Lyons, L., & Thorne, R. (1972). Parasitic Pitch Angle Diffusion of Radiation Belt Particles by Ion Cyclotron Waves. Journal Of Geophysical Research, 77, 5608-5616. http://doi.org/10.1029/JA077i028p05608 (Original work published October 1972)