Charge and isospin fluctuations in a non-ideal pion gas with dynamically fixed particle number E. E. Kolomeitsev, D. N. Voskresensky and M. E. Borisov Eur. Phys. J. A, 57 4 (2021) 145 Published online: 23 April 2021 DOI: 10.1140/epja/s10050-021-00457-0