A Comment on the Letter by G. P. Das et al., Phys. Rev. Lett. 63, 1168 (1989).
DOI:https://doi.org/10.1103/PhysRevLett.65.2083
©1990 American Physical Society
R. W. Godby and L. J. Sham
M. Schlüter
Vol. 65, Iss. 16 — 15 October 1990
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