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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