O. Gunnarsson

• Max-Planck-Institut für Festkörperforschung, Postfach 800665, D-7000 Stuttgart 80, West Germany

J. W. Allen

• Max-Planck-Institut für Festkörperforschung, Postfach 800665, D-7000 Stuttgart 80, West Germany
• Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1120

O. Jepsen, T. Fujiwara, and O. K. Andersen

• Max-Planck-Institut für Festkörperforschung, Postfach 800665, D-7000 Stuttgart 80, West Germany

C. G. Olsen

• Department of Physics and Ames Laboratory, U.S. Department of Energy, Iowa State University, Ames, Iowa 50011

M. B. Maple

• Department of Physics and Institute for Pure and Applied Physical Sciences, University of California at San Diego, La Jolla, California 92093

J.-S. Kang

• Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1120
• Department of Physics and Institute for Pure and Applied Physical Sciences, University of California at San Diego, La Jolla, California 92093

L. Z. Liu, J.-H. Park, and R. O. Anderson

• Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1120

W. P. Ellis

• Los Alamos National Laboratory, Los Alamos, New Mexico 87545

R. Liu

• Department of Physics and Ames Laboratory, U.S. Department of Energy, Iowa State University, Ames, Iowa 50011

J. T. Markert and Y. Dalichaouch

• Department of Physics and Institute for Pure and Applied Physical Sciences, University of California at San Diego, La Jolla, California 92093

Z.-X. Shen, P. A. P. Lindberg, B. O. Wells, D. S. Dessau, A. Borg, I. Lindau, and W. E. Spicer

• Stanford Electronics Laboratory, Stanford University, Stanford, California 94305