@book { FiniteElementStudyofPlaneWaveAcousticPhenomenainDucts,
    title = "Finite Element Study of Plane Wave Acoustic Phenomena in Ducts",
    author = "Juan {Betts}",
    year = "2000",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832420062",
    url = "https://m.diplom.de/document/217847"
}