1. Balogh, A., Beck, T.J., Forsyth, R.J., et al., The magnetic field investigations on the Ulysses mission: Instrumentation and preliminary scientific results, Astron. Astrophys. Suppl. Ser., 1992, vol. 92, pp. 221–236.
2. Bruno, R. and Carbone, V., The solar wind as a turbulence laboratory, Living Rev. Sol. Phys., 2005, vol. 2, pp. 1–186.
3. Forsyth, R.J., Balogh, A., Smith, E.J., and Gosling, J.T., Ulysses observations of the northward extension of the heliospheric current sheet, Geophys. Res. Lett., 1997, vol. 24, pp. 3101–3104.
4. Heinemann, M., Normals of non-WKB Alfvén waves in the solar wind, J. Geophys. Res., 1980, vol. 85, pp. 3435–3441.
5. Horbury, T.S., Balogh, A., Forsyth, R.J., and Smith, E.J., The rate of turbulent evolution over the Sun’s poles, Astron. Astrophys., 1996, vol. 316, pp. 333–341.