Sage, Leslie J.; Galletta, Giuseppe (December 1993). "Evolution in Dust Lane Ellipticals: Detection of Accreted Molecular Gas". The Astrophysical Journal. 419: 544. Bibcode:1993ApJ...419..544S. doi:10.1086/173507.
Sage, Leslie J.; Galletta, Giuseppe (December 1993). "Evolution in Dust Lane Ellipticals: Detection of Accreted Molecular Gas". The Astrophysical Journal. 419: 544. Bibcode:1993ApJ...419..544S. doi:10.1086/173507.