Aguilar, M., Alcaraz, J., Allaby, J., Alpat, B., Ambrosi, G., Anderhub, H., et al. (2007). Cosmic-ray positron fraction measurement from 1 to 30 GeV with AMS-01. Physics Letters B, 646(4), 145-154. doi:10.1016/j.physletb.2007.01.024.