E. . Meryem, E. A. . Omar, E.-C. E. . Kettani Najwa, E. H. . Moulay Rachid, J. . Mohamed, and F. . Meriem, “Multiple System Atrophy in MRI: The Typical Cross Sign”, Int J Cont Res Rev, vol. 11, no. 03, pp. 20771–20772, Mar. 2020.