1 J.E. Faller, P.L. Bender, J.L. Hall, D.. Hils, R.T. Stebbins, and M.A. Vincent, Advances in Space Research 9, (1989).
1 H.. Chatham, D.. Hils, R.M. Robertson, and A.C. Gallagher, The Journal of Chemical Physics 81, (1984).