Inner dusty envelope of the AGB stars W Hydrae, SW Virginis, and R Crateris using SPHERE/ZIMPOL T. Khouri, W. H. T. Vlemmings, C. Paladini, C. Ginski, E. Lagadec, M. Maercker, P. Kervella, E. De Beck, L. Decin, A. de Koter and L. B. F. M. Waters A&A, 635 (2020) A200 Published online: 03 April 2020 DOI: 10.1051/0004-6361/201834618