The circumstellar envelopes of the Cepheids 
Carinae and RS Puppis - Comparative study in the infrared with Spitzer, VLT/VISIR, and VLTI/MIDI
, and
A&A, 498 2 (2009) 425-443
Published online: 09 February 2009
DOI: 10.1051/0004-6361/200811307