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1¡¢Thermal expansion of solids at low temperatures
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2¡¢Solid State Physics - Ashcroft, Neil W, Mermin, David
     http://ishare.iask.sina.com.cn/f/22008970.html

3¡¢L.D.Landau and E.M.Lifshitz, Statistical Physics (Pergamon, New York, 1985),3rd ed. , p. 53

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