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2. G.K. White: Experimental Techniques in Low Temperature Physics, 3rd edn. ( Clarendon, Oxford 1979 )
3. R.C. Reid, J.M. Prausnitz, T.K. Sherwood: The Properties of Gases and Liquids ( McGraw-Hill, New York 1977 )
4. J. van Krankendonk: Solid Hydrogen ( Plenum, New York 1983 )
5. K.Motizuki, T. Nagamiya: J. Phys. Soc. Jpn. 11, 93 (1956); ibid. 12, 163 (1957)