VLTI-GRAVITY measurements of cool evolved stars - I. Variable photosphere and extended atmosphere of the Mira star R PegM. Wittkowski, G. Rau, A. Chiavassa, S. Höfner, M. Scholz, P. R. Wood, W. J. de Wit, F. Eisenhauer, X. Haubois and T. PaumardA&A, 613 (2018) L7DOI: https://doi.org/10.1051/0004-6361/201833029
