Linda P. Franzoni Franzoni, L. P., & Bliss, D. B. (1998). A discussion of modal uncoupling and an approximate closed-form solution for weakly coupled systems with application to acoustics. JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 103(4), 1923–1932. https://doi.org/10.1121/1.421344 Franzoni, L. P., & Elliott, C. M. (1998). An innovative design of a probe-tube attachment for a microphone. JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 104(5), 2903–2910. https://doi.org/10.1121/1.423873