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(20) Acoustics/Bessel Functions and the Kettledrum
(21) Paul Falstad
(22) Good Vibrations: Vibrating Circular Membrane and Bessel Functions. Heather Cameron and Dana Mullins. April 26, 2000.
(23) Normal vibration modes of a circular membrane
(24) The vibrating-membrane problem – based on basic principles and simulations. Hermann Härtel 1 and Ernesto Martin. IPN – Institute for Science Education, D-24098 Kiel. Universidad de Murcia, E-30071 Espinardo, Murcia.
(25) Wikepedia