@book { DesignofanAudioMultitoneRefinerSimulationofAudioFrequenciesAnalysisUsingActiveFilter,
    title = "Design of an Audio Multitone Refiner, Simulation of Audio Frequencies & Analysis Using Active Filter",
    author = "Blessed Olalekan {Oyebola}",
    year = "2017",
    publisher = "Anchor Academic Publishing",
    address = "Hamburg, Germany",
    url = "https://m.anchor-publishing.com/document/354120"
}