1. Free vibrations of prestressed toroidal membrane;Liepins;American Institute of Aeronautics and Astronautics Journal,1965
2. Flexural vibrations of the prestressed toroidal shell;Liepins;NASA CR-296,1965
3. Vibration study of a pressurized torus shell;Liepins;NASA CR-885,1967
4. Free vibrations of ring-stiffened toroidal shells;Balderes;American Institute of Aeronautics and Astronautics Journal,1973
5. Free vibrations of toroidal shells;Kosawada;Transactions of Japan Society of Mechanical Engineers (Series C),1985