Forced synchronization of an oscillator with a line of equilibria Ivan A. Korneev, Andrei V. Slepnev, Vladimir V. Semenov and Tatiana E. Vadivasova Eur. Phys. J. Special Topics, 229 12-13 (2020) 2215-2224 Published online: 28 September 2020 DOI: 10.1140/epjst/e2020-900146-9