1. A.J. Leggett, Quantum Liquids (Oxford University Press, Oxford, 2006)
2. D. Forster, Hydrodynamic Fluctuations, Broken Symmetry, and Correlation Functions (W.A. Benjamin, Inc., Reading, 1975)
3. H. Pleiner, H.R. Brand, in Pattern Formation in Liquid Crystals, ed. by A. Buka, L. Kramer (Springer, New York, 1996)
4. J. Maurer, P. Tabeling, Europhys. Lett. 43, 29 (1998)
5. S.R. Stalp, L. Skrbek, R.J. Donnelly, Phys. Rev. Lett. 82, 4831 (1999)