Soft and hard interactions in pp̄ collisions at √s=1800 and 630 GeV - Acosta, D; Affolder, T; Akimoto, H; Albrow, MG; Amaral, P; Ambrose, D; Amidei, D; Anikeev, K; Antos, J; Apollinari, G; Arisawa, T; Artikov, A; et al. (Physical Review D, 2002)