1. Mei, F.X.: Form invariance of Lagrange system. J. Beijing Inst. Technol. 2, 120–124 (2000)
2. Noether, E.: Invariant variational problems. Math. Phys. Klasse 2, 235–257 (1918)
3. Lutzky, M.: Dynamical symmetries and conserved quantities. J. Phys. A 12, 973–981 (1979)
4. Jiang, W.A., Luo, S.K.: Mei symmetry leading to Mei conserved quantity of generalized Hamilton systems. Acta Phys. Sin. 60, 060201 (2011)
5. Luo, S.K., Guo, Y.X., Mei, F.X.: Form invariance and Hojman conserved quantity for nonholonomic mechanical system. Acta Phys. Sin. 53, 2413–2418 (2004)