Cusp Energetic Particle Events Measured by POLAR Spacecraft (PDF Format)
T. A. Fritz, Jiasheng Chen, Robert B. Sheldon, Harlan E. Spence, Joseph F. Fennell, Stefano Livi, Christopher T. Russell and Jolene S. Pickett
Originally published in: Phys. Chem. Earth, Part C, 24, 135-140, 1999.