1. RS, M. and EICHINGER, A., Bericht Nr. 172 der Eidgen, Materialprüfungs-und Versuchsanstalt, Zürich, 1949, 65.
2. NÁDAI, A., “Theory of Flow and Fracture of Solids” Vol. I, New York, Toronto, London, 1950, 214.
3. MARIN, J., FAUPEL, J. H., DUTTON, V. L. and BROSSMAN, M. W., NACA Technical Note 1536, 1948.
4. BRIDGMAN, P. W., “Studies in Large Plastic Flow and Fracture” New York, Toronto, London, 1952, 80.