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

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Text this: The compound equation related to the Bessel-Helmholtz equation and the Bessel-Klein-Gordon equation