Olofsson, H. et al. (1993). “A study of circumstellar envelopes around bright carbon stars. I - Structure, kinematics, and mass-loss rate.”. The Astrophysical Journal Supplement Series87: 267. Bibcode: 1993ApJS...87..267O. doi:10.1086/191804. ISSN0067-0049.
Olofsson, H. et al. (1993). “A study of circumstellar envelopes around bright carbon stars. I - Structure, kinematics, and mass-loss rate.”. The Astrophysical Journal Supplement Series87: 267. Bibcode: 1993ApJS...87..267O. doi:10.1086/191804. ISSN0067-0049.
Olofsson, H. et al. (1993). “A study of circumstellar envelopes around bright carbon stars. I - Structure, kinematics, and mass-loss rate.”. The Astrophysical Journal Supplement Series87: 267. Bibcode: 1993ApJS...87..267O. doi:10.1086/191804. ISSN0067-0049.