Gravitational waves from preheating in Gauss–Bonnet inflationK. El Bourakadi, M. Ferricha-Alami, H. Filali, Z. Sakhi and M. BennaiEur. Phys. J. C, 81 12 (2021) 1144DOI: https://doi.org/10.1140/epjc/s10052-021-09946-4