1. KALTHOFF, J.F., “Time Effects and their Influences on Test Procedures for Measuring Dynamic Material Strength Values”, Int. Conf. Application of Fracture Mechanics to Materials and Structures, Freiburg, West-Germany, June, 1983
2. MANOGG, P., “Anwendung der Schattenoptik zur Untersuchung des Zerreißvorgangs von Platten”, Dissertation, Universitat Freiburg, Germany, 1964
3. MANOGG, P., “Schattenoptische Messung der spezifischen Bruch- energie wahrend des Bruchvorgangs bei Plexiglas”, Proc. Int. Conf. Physics of Non-Crystalline Solids, Delft, The Netherlands, pp. 481 – 490, 1964
4. THEOCARIS, P.S., “Local Yielding Around a Crack Tip in Plexiglas”, J.Appl.Mech., Vol. 37, pp. 409 – 415, 1970
5. BEINERT, J., and KALTHOFF, J.F., “Experimental Determination of Dynamic Stress Intensity Factors by Shadow Patterns” in Mechanics of Fracture, Vol. 7, Ed. G.C. Sih, Martinus Nijhoff Publishers, The Hague, Boston, London, pp. 281–330, 1981