SZUMOWSKI, Andrzej P., and Janusz PIECHNA. “Self-Excited Flow Oscillation in an Abruptly Expanding Circular Duct As the Noise Source”. Archives of Acoustics 8, no. 4 (March 7, 2016): 317–330. Accessed July 9, 2025. https://acoustics.ippt.pan.pl/index.php/aa/article/view/3262.