A. Blinc, J. Buturović Ponikvar, and Z. Fras, “The Prevalence of COVID-19 Among Health Care Personnel in a University Hospital by the End of 2020, and Ambient Air CO2 in Hospital Rooms Ventilated by Window-Opening in 2021/22”, sv-jme, vol. 68, no. 4, pp. 265–271, Apr. 2022.