1. On the extremum potential variational principle for geometrical nonlinear thin elastic shells;Gao;Scientia Sinica (A),1990
2. Opposite principles for nonlinear conservative systems;Gao;Adv. in Appl. Math.,1989
3. Dual extremum principles in finite deformation elastoplastic analysis;Gao;Acta Appl. Math.,1990
4. Geometrical nonlinearity: Potential energy, complementary energy and the gap function;Gao;17th IUTAM, Grenoble, France. Quart. Appl. Math.,1989
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