1. ISO R 1767, ?Vulcanized Rubbers?Determination of Rebound Resilience,? Lüpke Pendulum Method (1971).
2. ?Comparison between Lüpke pendulum and Oberto micropendulum,? ISO/TC 45/WG E (Italy) 90 (Oct., 1966).
3. ?Comparison between a Lüpke and a Schob type pendulum having the same fundamental elements,? ISO/TC 45/WG E (Italy) 109 (July, 1967).
4. ?Tentative Outline for Standardization of Resilience Measuring Pendula,? ISO/TC 45/WG E (Italy) 107 (July, 1967).