The extended molecular envelope of the asymptotic giant branch star π1 Gruis as seen by ALMA - II. The spiral-outflow observed at high-angular resolution
L. Doan, S. Ramstedt, W. H. T. Vlemmings, S. Mohamed, S. Höfner, E. De Beck, F. Kerschbaum, M. Lindqvist, M. Maercker, C. Paladini and M. Wittkowski
