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2. Variational Principles in Dynamics and Quantum Theory;Yourgrau,1968
3. On a general method in dynamics;Hamilton;Philos. Trans. Roy. Soc.,1834
4. Rayleigh's principle via least action;Papastavridis;J. Sound Vibration,1986
5. Second essay on a general method in dynamics;Hamilton;Phil. Trans. Roy. Soc.,1835