1. L. V. Heilbrunn, The Viscosity of Protoplasm, Protoplasmatologia, Vol. 2, C1 (Springer-Verlag, Vienna 1958), p. 89.
2. J. F. Danielli, Cell Physiology and Pharmacology (Elsevier Publishing Co. Inc., New York 1950), pp. 75–78.
3. A. D. Welch and E. Bueding, in Currents in Biochemical Research, Ed. by D. E. Green (Interscience Publishers Inc., New York 1946), p. 401.
4. J. J. Burns and P. A. Shore, Ann. Rev. Pharmacol. 1 (1961), 79.
5. J. A. Bain and S. E. Mayer, Ann. Rev. Pharmacol. 2 (1962), 37.