1. Bayliss, W. M., 1920, The properties of colloidal systems. IV. Reversible gelation in living protoplasm. Proc. Roy. Soc. London, series B, Bd. 91, S. 196.
2. Becking Baas, L. G. M., Bakhuyszen, H. v. d. Sande and H. Hotelling, 1928, The physical state of protoplasm. Verh. d. k. Akad. v. Wetensch. t. Amsterdam, Afd. Natuurk. (Tweede Seetie) Deel 25, No. 5.
3. Brinley, F. J., 1928, The effect of chemicals on viscosity of protoplasm of amoeba as indicated by Brownian movement. Protoplasma Bd. 4, S. 177.
4. Chifflot, J. et C. Grautier, 1905, Sur les mouvements browniens intraprotoplasmique. Compt. Rond. Soc. Biol. Bd. 58.
5. Einstein, A., 1922, Untersuchungen über die Theorie der „Brownschen Bewegung“. Ostwalds Klassiker Nr. 199, Leipzig 1922.