Millan, R., McCarthy, M., Sample, J., Smith, D., Thompson, L., McGaw, D., et al. (2013). The Balloon Array for RBSP Relativistic Electron Losses (BARREL). Space Science Reviews, 179. http://doi.org/10.1007/s11214-013-9971-z (Original work published November 2013)
Woodger, L., Halford, A., Millan, R., McCarthy, M., Smith, D., Bowers, G., et al. (2015). A Summary of the BARREL Campaigns: Technique for studying electron precipitation. Journal Of Geophysical Research: Space Physics. http://doi.org/10.1002/2014JA020874 (Original work published May 2015)