Measurement of negatively charged pion spectra in inelastic p plus p interactions at p(lab)=20, 31, 40, 80 and 158 GeV/c - Abgrall, N.; Aduszkiewicz, A.; Ali, Y.; Anticic, T.; Antoniou, N.; Baatar, B.; Bay, F.; Blondel, A.; Blumer, J.; Bogomilov, M.; Bravar, A.; Brzychczyk, J.; et al. (EUROPEAN PHYSICAL JOURNAL C, 2014)