1. 星际介质中的元素丰度
Wilson T. L. & Rood R. 1994， ARA&A, 32, 191
http://adsabs.harvard.edu/abs/1994ARA%26A..32..191W
2. 氢分子柱密度的紫外观测
Spitzer L., Drake J.F., Jenkins E.B., Morton D.C., Rogerson J.B., York D.G. 1973, ApJ, 181, L116
http://adsabs.harvard.edu/abs/1973ApJ...181L.116S
3. 氢原子总柱密度与消光
Savage B.D. & Jenkins E.B. 1972, ApJ, 172, 491
http://adsabs.harvard.edu/abs/1972ApJ...172..491S
4. 星际介质中的分子丰度
Jenkins E.B., Drake J.F., Morton D.C., Rogerson J.B., Spitzer L., York D. G. 1973, ApJ, 181, L122
http://adsabs.harvard.edu/abs/1973ApJ...181L.122J
van Dishoeck E.F. & Black J. H. 1986, ApJS, 62, 109
http://adsabs.harvard.edu/abs/1986ApJS...62..109V
