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3. G. Hartwig: Report 03.01.01 P4 2A (1985), Nuclear Res. Center Karlsruhe.
4. J.R. Benzinger: Adv. in Cryogen. Engineering, 28 (1982), p. 231, Plenum Press.
5. G. Hartwig: Cryogenics 28 (1988) p. 255.