VLTI-GRAVITY measurements of cool evolved stars: I. Variable photosphere and extended atmosphere of the Mira star R Peg - Wittkowski, Markus; Rau, G.; Chiavassa, A.; Höfner, S.; Scholz, Michael; Wood, P. R.; Wit, W. J. de; Eisenhauer, F.; Haubois, X.; Paumard, T. (Astronomy and astrophysics, 2018)
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