1. Tchen, C. M., Mean value and correlation problems connected with the motion of small particles suspended in a turbulent fluid. Dissertation Delft 1947, Martinus Nijhoff, the Hague.
2. See e.g. Burgers, J. M., On the motion of small particles of elongated form, suspended in a viscous fluid, Ch. III of Second Rep. on Visc. and Plast., North-Holland Publ. Co., Amsterdam, 1938.