1. Cited fromScott Blair, G. W. andM. Reiner, Agricultural Rheology (London 1957).
2. Malpighi cited in (5).
3. Spalanzani cited in (5).
4. Haller, A, von cited in (5).
5. Poiseuille, J. L. M., Compt. Rend. Académie des Sciences1, 554, séance publique du 28 Déc. 1835; Acad. Sci. Savants Etrangers,7/44, (1839).