Measurement of prompt hadron production ratios in pp collisions at ¿s = 0.9 and 7 TeV - Aaij, R.; Abellan Beteta, C.; Adametz, A.; Adeva, B.; Adinolfi, M.; Adrover, C.; Affolder, A.; Ajaltouni, Z.; Albrecht, J.; Alessio, F.; Alexander, M.; Ali, S.; et al. (European Physical Journal c, 2012)