publication venue for Low rank perturbation of regular matrix pencils with symmetry structures. 22:257-311. 2021 Word series for dynamical systems and their numerical integrators. 17:675-712. 2017 Erratum to: Higher-Order Averaging, Formal Series and Numerical Integration II: The Quasi-Periodic Case. 17:625-626. 2017 Higher-order averaging, formal series and numerical integration III: error bounds. 15:591-612. 2015