Published in Phys. Rev. D 59, 104009 (1999) and
based in part on a talk given at the Sixth Midwestern
Relativity Conference, St. Louis, November 13-14,1997, and
on part of a report given in the session ``Casimir Effect''
originally published in the Proc. of the Eighth Marcel Grossmann
Meeting on General Relativity, Jerusalem, June 23-27, 1997, edited by
Tsvi Piran (World Scientific, Singapore, 1998)
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