<PAGE>

                                      any Senior Vice President
                                      any Vice President
                                      any Assistant Vice President
                                      any Senior Authorized
                                       Officer
                                      any Senior Trust Officer
                                      any Trust Officer

5.    The foregoing resolution supersedes the resolution adopted by this Board
      of Directors on August 1, 1988 as amended, naming the officers of this
      Bank authorized to act pursuant to the authority above set forth.



                                 CERTIFICATION
                             ---------------------

  I,   Cheryl Sorokin, Secretary of Bank of America National Trust and Savings
     ------------------                                                         
Association, a national banking association existing under the laws of the
United States of America, having its principal place of business in the City and
County of San Francisco in the State of California, certify that the foregoing
is a correct copy of a resolution adopted by the Board of Directors in
accordance with the bylaws at a meeting held on June 23, 1992.  This resolution
is still in effect.


                                               /s/ CHERYL SOROKIN
                                   -------------------------------------------
                                                  Secretary
                                       BANK OF AMERICA NATIONAL TRUST
                                          AND SAVINGS ASSOCIATION


 Dated:    January 19, 1994
         --------------------

                                       4