URBAŃCZYK, M., W. JAKUBIK, E. ADAMCZYK, and J. RZESZOTARSKA. 2014. “Devices for Measurement of the NO2 Concentration in the Air by Means of Surface Acoustic Waves”. Archives of Acoustics 22 (2): 197-206. https://acoustics3.ippt.pan.pl/index.php/aa/article/view/950.