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

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Text this: Fundamentals of the physics of solids. Volume 2, Electronic properties