1. Applications of rotated vector fields, I;Chen;J. Nanjing University,1963
2. Applications of rotated vector fields, II;Chen;J. Nanjing University,1963
3. Generalized rotated vector fields;Chen;J. Nanjing University,1975
4. Methods of Bifurcation Theory;Chow,1982
5. Limit cycles and rotated vector fields;Duff;Ann. of Math.,1953