J. MOTYLEWSKI and J. RANACHOWSKI, “Photoacoustic spectroscopy as a method in biological investigations”, Arch. Acoust., vol. 9, no. 1-2, pp. 51–56, Jul. 2015, Accessed: Apr. 25, 2025. [Online]. Available: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/3187