1. Lorentz, H. (1906), Abh. u. Th. Phys., 82,541.
2. Happel, J. and Brenner, H. (1965), Low Reynolds Number Hydrodynamics,Prentice Hall (1951).
3. Hawksley, P.G.W. (1951), BCURA Bull, 15,4.
4. Cunningham, E. (1910), Proc. R. Soc.,A83,357.
5. Davies, C.N. (1954), Proc. Phys. Soc.,57,259.