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

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Text this: Upper and lower bounds for natural frequencies: A property of the smoothed finite element methods