| References
Astronomy: From the Earth to the Universe (5th Ed) by Jay M. Pasachoff, Saunders College Publishing, 1998. The Astronomical Evolution of the Interstellar Medium by Emma L. O. Bakes, Twin Press Astronomy Publishers, Holland, 1997 "Interstellar Chemistry" by A. Delgarno in Chemistry in Space, J. M. Greenberg and V. Pirronello (eds.) NATO ASI Series, vol. 323, Kluwer Academic Publishers, 1989. |