8 citations as recorded by crossref.

1. The onset phase of upstream energetic (>25 keV) ion events: Interball-1/DOK-2 observations E. Vassiliadis & G. Anagnostopoulos https://doi.org/10.1016/S0273-1177(03)00076-0
2. Dawn–dusk asymmetry in spatial distribution and origin of energetic ion events upstream the Earth's bow shock G. Anagnostopoulos et al. https://doi.org/10.1016/j.pss.2004.09.028
3. Jovian Periodicities (~10 h, ~40, 20, 15 min) at ACE, Upstream from the Earth’s Bow Shock, on 25–27 November 2003 G. Anagnostopoulos et al. https://doi.org/10.3390/universe9080357
4. The Quasi-Perpendicular Bow Shock as a Temporal Trapping Barrier and Accelerator of Magnetospheric Particles G. Anagnostopoulos et al. https://doi.org/10.1109/TPS.2008.918676
5. Evidence and features of magnetospheric particle leakage on days 30–36, 1995: Wind, Geotail, and IMP 8 observations compared G. Anagnostopoulos et al. https://doi.org/10.1029/2004JA010827
6. Multiple spacecraft observations of energetic ions during a high solar wind pressure event J. Chen et al. https://doi.org/10.1029/2005JA011043
7. High energy ions and electrons upstream from the Earth's bow shock and their dependence on geomagnetic conditions: Statistical results between years 1982–1988 G. Anagnostopoulos et al. https://doi.org/10.1029/1999GL900321
8. Acceleration sites of energetic ions upstream of the Earth's bow shock and in the magnetosheath: Statistical study on charge states of heavy ions K. Keika et al. https://doi.org/10.1029/2003JA009953