Ferromagnetism and ferroelectricity in EuX (X = O, S): pressure effects Mostefa Djermouni, Ali Zaoui, Salima Kacimi, Nawel Benayad and Abdelkader Boukortt Eur. Phys. J. B, 91 2 (2018) 28 Published online: 07 February 2018 DOI: 10.1140/epjb/e2017-80604-7