Mathematical modelling for pseudorapidity distribution of hadron-hadron collisions Mahmoudi Y. El-Bakry, El-Sayed A. El-Dahshan and Salah Y. El-Bakry Eur. Phys. J. Plus, 130 1 (2015) 17 Published online: 30 January 2015 DOI: 10.1140/epjp/i2015-15017-5