PANUSZKA, Ryszard, and Jacek CIEŚLIK. “Verification Tests of a Method of Determining Sound Intensity With the Application of a Two Microphone Technique”. Archives of Acoustics, vol. 10, no. 4, July 2015, pp. 401-10, https://acoustics3.ippt.pan.pl/index.php/aa/article/view/3175.