J. ŻERA, T. BOEHM, and T. ŁĘTOWSKI, “Application of an automatic audiometer in the measurement of the directional characteristic of hearing”, Arch. Acoust., vol. 7, no. 3-4, pp. 197–206, Dec. 1982, Accessed: Apr. 22, 2026. [Online]. Available: http://acoustics.ippt.gov.pl/index.php/aa/article/view/3282