Proton-proton collisions at ultra-relativistic energies in quark-gluon string model L. Bravina, J. Bleibel, L. Malinina, M.S. Nilsson and E. Zabrodin EPJ Web of Conferences, 70 (2014) 00015 Published online: 10 April 2014 DOI: 10.1051/epjconf/20147000015