1. O.V. Lounasmaa: Experimental Principles and Methods Below I K ( Academic, London 1974 )
2. D.S. Betts: Refrigeration and Thermometry Below One Kelvin (Sussex Univ. Press, Brighton 1976 )
3. R.P. Hudson: Principles and Application of Magnetic Cooling ( North-Holland, Amsterdam 1972 )
4. D.S. Betts: An Introduction to Millikelvin Technology (Cambridge Univ. Press, Cambridge 1989 )
5. B.I. Bleaney, B. Bleaney: Electricity and Magnetismus, 3rd ed. ( Oxford Univ. Press, Oxford 1976 )