The detached dust shells around the carbon AGB stars R Sculptoris and V644 ScorpiiM. Maercker, S. Ramstedt, M. L. Leal-Ferreira, G. Olofsson and H. G. FlorenA&A, 570 (2014) A101DOI: https://doi.org/10.1051/0004-6361/201424892
