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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