Ionization and fragmentation of valine molecules in the gas phase by electron impactA. N. Zavilopulo, A. I. Bulhakova, S. S. Demes, E. Yu. Remeta and A. V. VasilievEur. Phys. J. D, 75 11 (2021) 287DOI: https://doi.org/10.1140/epjd/s10053-021-00294-2