HERAFitter - Open source QCD fit project S. Alekhin, O. Behnke, P. Belov, S. Borroni, M. Botje, D. Britzger, S. Camarda, A. M. Cooper-Sarkar, K. Daum, C. Diaconu et al. (43 more) Eur. Phys. J. C, 75 7 (2015) 304 Published online: 02 July 2015 DOI: 10.1140/epjc/s10052-015-3480-z