Agent-based model for the h-index – exact solution Barbara Żogała-Siudem, Grzegorz Siudem, Anna Cena and Marek Gagolewski Eur. Phys. J. B, 89 1 (2016) 21 Published online: 27 January 2016 DOI: 10.1140/epjb/e2015-60757-1