1. Selection rules for the splitting of the degenerate pairs of natural frequencies of thin circular rings;Perrin;Acustica,1971
2. Perturbation studies with a thin circular ring;Charnley;Acustica,1973
3. Studies with an eccentric bell;Charnley;Journal of Sound and Vibration,1978
4. Messungen zu den Theorien der Eigenschwingungen von Kreisringen beliebiger Wandstärke;Kuhl;Akustische Zeitschrift,1942
5. A Treatise on the Mathematical Theory of Elasticity;Love,1944