Scattering of the fundamental torsional mode at an axial crack in a pipeRatassepp, Madis; Fletcher, Sam; Lowe, Michael John StewartThe journal of the Acoustical Society of America2010 / 2, p. 730-740 : ill https://pubs.aip.org/asa/jasa/article/127/2/730/917913/Scattering-of-the-fundamental-torsional-mode-at-an