Please include the following two references when using MORLAB in your work:

[1] P. Benner and S. W. R. Werner. MORLAB—The Model Order Reduction LABoratory.
    In P. Benner, T. Breiten, H. Faßbender, M. Hinze, T. Stykel, and
    R. Zimmermann, editors, Model Reduction of Complex Dynamical Systems,
    volume 117 of International Series of Numerical Mathematics, pages 393–415.
    Birkhäuser, Cham, 2021. doi:10.1007/978-3-030-72983-7_19

[2] P. Benner, J. Saak, and S. W. R. Werner. MORLAB – Model Order Reduction
    LABoratory (version 6.0), September 2023.
    See also: https://www.mpi-magdeburg.mpg.de/projects/morlab.
    doi:10.5281/zenodo.7072831

Please include the following two references when using SOMDDPA in your work:

[1] S. W. R. Werner. Structure-Preserving Model Reduction for Mechanical
    Systems. Dissertation, Otto-von-Guericke-Universität, Magdeburg,
    Germany, 2021. doi:10.25673/38617

[2] P. Benner and S. W. R. Werner. SOMDDPA – Second-Order Modally-Damped
    Dominant Pole Algorithm (version 2.0), April 2021.
    doi:10.5281/zenodo.3997649

Please include the following two references when using SOLBT in your work:

[1] P. Benner and S. W. R. Werner. Frequency- and time-limited balanced
    truncation for large-scale second-order systems. Linear Algebra Appl.,
    623:68–103, 2021. Special issue in honor of P. Van Dooren, Edited by
    F. Dopico, D. Kressner, N. Mastronardi, V. Mehrmann, and R. Vandebril.
    doi:10.1016/j.laa.2020.06.024

[2] P. Benner and S. W. R. Werner. SOLBT – Limited balanced truncation for
    large-scale sparse second-order systems (version 3.0), April 2021.
    doi:10.5281/zenodo.4600763