Andreas RauhRamona WestphalHarald AschemannEkaterina AuerExponential Enclosure Techniques for Initial Value Problems with Multiple Conjugate Complex Eigenvalues.247-2562014SCANhttps://doi.org/10.1007/978-3-319-31769-4_20conf/scan/2014db/conf/scan/scan2014.html#RauhWAA14