Add models of dynamical effect for ETVs from [Borkovits et al. (2015)](https://ui.adsabs.harvard.edu/#abs/2015MNRAS.448..946B/abstract) - in appendix B. Applied in [Borkovits et al. (2016)](https://ui.adsabs.harvard.edu/#abs/2016MNRAS.455.4136B/abstract) (sec. 2.2 - eq. 9-11) and [Masuda (2017)](https://ui.adsabs.harvard.edu/#abs/2017AJ....154...64M/abstract) (appendix A.1). Details in email communication with Caglayan Nehir.
Add models of dynamical effect for ETVs from Borkovits et al. (2015) - in appendix B. Applied in Borkovits et al. (2016) (sec. 2.2 - eq. 9-11) and Masuda (2017) (appendix A.1).
Details in email communication with Caglayan Nehir.