@article{articlee718f6dc,
title   = {Precision measurement of the helium flux in primary cosmic rays of rigidities 1.9 GV to 3 TV with the alpha magnetic spectrometer on the international space station},
author = {Aguilar, M. and Vecchi, Manuela},
year = {2015},
doi = {10.1103/PhysRevLett.115.211101},
journal   = {Physical Review Letters}
}