Comparing the biocidal properties of non-thermal plasma sources by reference protocolJosef Khun, Jana Jirešová, Lucie Kujalová, Pavel Hozák and Vladimír ScholtzEur. Phys. J. D, 71 10 (2017) 263DOI: https://doi.org/10.1140/epjd/e2017-80115-9