1. E. Schrödinger, Naturwissenschaften 23, 516 (1935). Translation: J.D. Trimmer, Proc. Am. Philos. Soc. 124, 323 (1980)
2. A.J. Leggett, J. Phys., Colloq. 39(C6), 126 (1978)
3. L. Néel, Ann. Geophys. 5, 99 (1949). Ibid., Cah. Phys. 12, 1 (1942); Ibid., 13, 1 (1943); see also, L. Néel, Oeuvre Scientifique (Editions CNRS, 1978)
4. R.F. Voss, R.A. Webb, Phys. Rev. Lett. 47, 265 (1981)
5. A.J. Leggett, J. Phys., Colloq. 39(C6), 1264 (1978); Ibid., in Proceedings of the 6th Int. Conf. on Noise in Physical Systems, Gaithersburg, Maryland (1981)