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Czubaj-Kowal, M., Friediger, T., Połcik-Jastrząb, M., Sokołowski, M. and Hudakova, Z. 2019. Assessment of the concentration of nitric oxide in exhaled air (FeNO) in primary school children in Krakow and Ruzomberk in relation to air pollution in these cities. Medicni perspektivi. 24, 4 (Dec. 2019), 36–43. DOI:https://doi.org/10.26641/2307-0404.2019.4.189194.