Effective ionization coefficients for low current dc discharges in alcohol vapours at low pressure Jelena Marjanović, Dragana Marić, Gordana Malović and Zoran Lj. Petrović Eur. Phys. J. D, 75 6 (2021) 191 Published online: 29 June 2021 DOI: 10.1140/epjd/s10053-021-00138-z