Keywords: Acoustics bessel ketteldrum.JPG Bessel Functions and the Ketteldrum en wikibooks Adrignola CommonsHelper 2006-03-07 Booby wikibooks en b English Wikibooks Booby Original upload log page en wikibooks Acoustics_bessel_ketteldrum JPG 2006-03-07 23 33 Booby 568×224× 30621 bytes <nowiki></nowiki> Acoustics Wikibook Bessel Functions and the Ketteldrum Bessel functions |