1. M. Boudart, in Proceedings of the Robert A. Welch Foundation Conference on Chemical Research. XIV Solid State Chemistry, edited by W.O. Milligan (The Robert A. Welch Foundation, Houston, Texas, 1970), p. 299.
2. J.H. Sinfelt, in Annual Review of Materials Science, edited by R.A. Huggins, R.H. Bube, and R.W. Roberts (Annual Reviews, Palo Alto, California, 1972), V. 2, p. 641.
3. J.F. Anderson, Structure of Metallic Catalysts (Academic, New York, 1975).
4. Electronic Density of States, edited by L.H. Bennett (National Bureau of Standards Spec. Pub. 323, Washington, D.C. 1971).
5. R.C. Baetzold, J.Chem.Phys. 55, 4363 (1971).