Frequency level repulsion and exchange of normal-mode shapes at avoided crossings in 1D dissimilar coupled elastic resonatorsWilliam Rodríguez-Cruz, José Concepción Torres-Guzmán, Miguel Ángel Velasco-Castillo and Alfredo Díaz-de-AndaEur. Phys. J. Plus, 137 1 (2022) 9DOI: https://doi.org/10.1140/epjp/s13360-021-02239-5