<PAGE>
Page 9 of 9 Pages
EXHIBIT 3 ------------------
MORGAN STANLEY DEAN WITTER
INVESTMENT MANAGEMENT LIMITED
SECRETARY'S CERTIFICATE
I, Richard S. Rosenthal, a duly elected and acting Secretary of Morgan
Stanley Dean Witter Investment Management Limited, a Company incorporated under
the laws of England and Wales, certify the following persons are each authorised
to sign reports to be filed under Sections 13 and 16 of the Securities Exchange
Act of 1934 on behalf of the Company, and such authorisations are in full force
and effect as of this date:
Harold J. Schaaff
Donald P. Ryan
IN WITNESS WHEREOF, I have hereunto set my name and affixed the seal of the
Company as of the 29th day of January 1999.
/s/ Richard S. Rosenthal
---------------------------
Richard S. Rosenthal
Secretary
