1. Arnold, V., Khesin, B.: Topological Methods in Hydrodynamics. Springer, Berlin (1990)
2. Arnold, V., Zeldovich, Ya.B., Ruzmaikin, A., Sokoloff, D.D.: J. Exp. Theor. Phys. 81(6), 2052 (1981)
3. Arnold, V., Zeldovich, Y.B., Ruzmaikin, A., Sokoloff, D.D.: Dokl. Akad. Nauk SSSR 266(6), 1357 (1982)
4. Barrow, J., Tsagas, C.: Phys. Rev. D (2008)
5. Barrow, J., Tsagas, C.: Phys. Rev. D (2008)