Linsky J.L., D.M. Hunten, R. Sowell, D.L. Glackin, and W.L. Kelch, The Astrophysical Journal Supplement Series 41, 481 (1979).
Linsky J.L., D.M. Hunten, R. Sowell, and D.L. Glackin, Bulletin Of The American Astronomical Society 9, (1977).