ŁĘTOWSKI, Tomasz, and Wojciech MAKOWSKI. “Psychoacoustic Investigation of Listening With Quadrophonic Earphones”. Archives of Acoustics 5, no. 1 (March 7, 2016): 59–72. Accessed January 17, 2026. https://acoustics.ippt.gov.pl/index.php/aa/article/view/3327.