K. Antalné Bökfi, K. P. Klucsik, T. Varga, and E. Domokos, “Opportunities to the urban air quality of characterization by the cost-effective electrochemical sensors”, IJEMS, vol. 4, no. 2, pp. 1–16, Jun. 2019, doi: 10.21791/IJEMS.2019.2.1.