1. Abies, H.D. 1971, Pub. USNaval Observatory, Series II
20, Part 4
2. Bhat, C.L., Mayer, C.J., and Wolfendale, A.W. 1986, Phil. Trans. R. Soc. London A, 319, 249
3. Blitz, L. 1978, Ph.D. Thesis, Columbia University
4. Blitz, L. 1987, in Physical Processes in Interstellar Clouds, ed. G.E. Morfill and M. Scholer, ( Dordrecht: Reidel ), p. 35
5. Blitz, L., Stark, A.A., and Long, K. 1989, in preparation