Evolution of dark energy perturbations for Slotheon field and power spectrum Upala Mukhopadhyay, Debasish Majumdar and Debabrata Adak Eur. Phys. J. C, 80 6 (2020) 593 Published online: 30 June 2020 DOI: 10.1140/epjc/s10052-020-8165-6