1. D. S. Betts An Introduction to Millikelvin Technology (Cambridge University Press, Cambridge 1965)
2. Springer Ser. Sol. St. Sci.,1988
3. G. Bergmann, Phys. Rep. 107 1 (1984)
4. D. Vollhardt, P. Wölfle, in: Electronic Phase Transitions W. Hanke, Yu. V. Kopaev (eds) p. 1 (Elsevier Science Publishers, 1992)
5. J.-L. Pichard, in Quantum Coherence in Mesoscopic Systems edited by B. Kramer, NATO ASI Ser. B 254 369 (1991)