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 __   _     ______   _    _     ______    _____   
| || | ||  /_   _// | \  / ||  /_   _//  /  ___|| 
| '--' ||   -| ||-  |  \/  ||   -| ||-  | // __   
| .--. ||   _| ||_  | .  . ||   _| ||_  | \\_\ || 
|_|| |_||  /_____// |_|\/|_||  /_____//  \____//  
`-`  `-`   `-----`  `-`  `-`   `-----`    `---`

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Text this: Condition monitoring of bearings using vibrations / Rasyidah Othman and Zuraidi Yusof