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- [8] On invariant tori of vector field under weaker non-degeneracy condition NODEA-NONLINEAR DIFFERENTIAL EQUATIONS AND APPLICATIONS, 2015, 22 (05): : 1381 - 1394
- [9] On invariant tori of vector field under weaker non-degeneracy condition Nonlinear Differential Equations and Applications NoDEA, 2015, 22 : 1381 - 1394