Quasinormal modes of gravitational perturbation around regular Bardeen black hole surrounded by quintessenceMahamat Saleh, Bouetou Bouetou Thomas and Timoleon Crepin KofaneEur. Phys. J. C, 78 4 (2018) 325DOI: https://doi.org/10.1140/epjc/s10052-018-5818-9