1

                                                               EXHIBIT (a)(1)(F)

            GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
                         NUMBER ON SUBSTITUTE FORM W-9

GUIDELINES FOR DETERMINING THE PROPER IDENTIFICATION NUMBER TO GIVE THE
PAYER.--Social Security numbers have nine digits separated by two hyphens: i.e.
000-00-0000. Employer identification numbers have nine digits separated by only
one hyphen: i.e. 00-0000000. The table below will help determine the number to
give the payer.



- ------------------------------------------------------------
                                              GIVE THE
                                           SOCIAL SECURITY
       FOR THIS TYPE OF ACCOUNT:             NUMBER OF--
- ------------------------------------------------------------
                                   
 1.  An individual's account             The individual
 2.  Two or more individuals (joint      The actual owner of
     account)                            the account or, if
                                         combined funds, the
                                         first individual on
                                         the account(1)
 3.  Custodian account of a minor        The minor(2)
     (Uniform Gift to Minors Act)
 4.  a. The usual revocable savings      The grantor-
        trust account (grantor is also   trustee(1)
        trustee)
     b. So-called trust account that is  The actual owner(1)
        not a legal or valid trust
        under State law
 5.  Sole proprietorship account         The Owner(3)

- ------------------------------------------------------------




- ------------------------------------------------------------
                                              GIVE THE
                                           SOCIAL SECURITY
       FOR THIS TYPE OF ACCOUNT:             NUMBER OF--
- ------------------------------------------------------------
                                   
 6.  A valid trust, estate, or pension   Legal entity (Do
     trust                               not furnish the TIN
                                         of the personal
                                         representative or
                                         trustee unless the
                                         legal entity itself
                                         is not designated
                                         in the account
                                         title.)(4)
 7.  Corporate account                   The corporation
 8.  Partnership                         The partnership
 9.  Association, club, religious,       The organization
     charitable, educational or other
     tax-exempt organization
10.  A broker or registered nominee      The broker or
                                         nominee
11.  Account with the Department of      The public entity
     Agriculture in the name of a
     public entity (such as a State or
     local government, school district,
     or prison) that receives
     agricultural program payments
- ------------------------------------------------------------


(1) List first and circle the name of the person whose number you furnish.
(2) Circle the minor's name and furnish the minor's social security number.
(3) Show the name of the owner.
(4) List first and circle the name of the legal trust, estate, or pension trust.

NOTE: If no name is circled when there is more than one name, the number will be
      considered to be that of the first name listed.

                                        1
   2

            GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
                         NUMBER ON SUBSTITUTE FORM W-9

                                     PAGE 2

OBTAINING A NUMBER
If you don't have a taxpayer identification number or you don't know your
number, obtain Form SS-5, Application for a Social Security Number Card, or Form
SS-4, Application for Employer Identification Number (for business and all other
entities), at the local office of the Social Security Administration or the
Internal Revenue Service and apply for a number.

PAYEES EXEMPT FROM BACKUP WITHHOLDING
Payees specifically exempted from backup withholding on ALL payments include the
following:
  - An organization exempt from tax under Section 501(a) of the Internal Revenue
    Code of 1986, as amended (the "Code"), any IRA, or a custodial account under
    Section 403(b)(7), if the account satisfies the requirements of Section
    401(f)(2).
  - The United States or any of its agencies or instrumentalities.
  - A State, the District of Columbia, a possession of the United States, or any
    of their political subdivisions or instrumentalities.
  - A foreign government, a political subdivision of a foreign government, or
    any agency or instrumentality thereof.
  - An international organization or any agency or instrumentality thereof.
  Other payees that may be exempt from back-up withholding include:
  - A corporation.
  - A foreign central bank of issue.
  - A dealer in securities or commodities required to register in the U.S., the
    District of Columbia or a possession of the U.S.
  - A real estate investment trust.
  - An entity registered at all times during the tax year under the Investment
    Company Act of 1940.
  - A common trust fund operated by a bank under 584(a) of the Code.
  - A financial institution.
  - A middleman known in the investment community as a nominee or who is listed
    in the most recent publication of the American Society of Corporate
    Securities, Inc., Nominee List.
  - A trust exempt from tax under Section 664 or described in Section 4947(a)(1)
    of the Code.
Payments of dividends and patronage dividends not generally subject to backup
withholding including the following:
  - Payments to nonresident aliens subject to withholding under Section 1441 of
    the Code.
  - Payments to partnerships not engaged in a trade or business in the U.S. and
    which have at least one nonresident partner.
  - Payments of patronage dividends where the amount received is not paid in
    money.
  - Payments made by certain foreign organizations.
  - Section 404(k) payments made by an ESOP.
  Payments of interest not generally subject to backup withholding include the
following:
  - Payments of interest on obligations issued by individuals. NOTE: You may be
    subject to backup withholding if this interest is $600 or more and is paid
    in the course of the payer's trade or business and you have not provided
    your correct taxpayer identification number to the payer.
  - Payments of tax-exempt interest (including exempt-interest dividends under
    Section 852 of the Code).
  - Payments described in Section 6049(b)(5) of the Code to nonresident aliens.
  - Payments on tax-free covenant bonds under Section 1451 of the Code.
  - Payments made by certain foreign organizations.
  - Payments made to a nominee.
  - Mortgage interest paid to you.
EXEMPT PAYEES DESCRIBED ABOVE SHOULD FILE A FORM W-9 TO AVOID POSSIBLE ERRONEOUS
BACKUP WITHHOLDING. FILE THIS FORM WITH THE PAYER, FURNISH YOUR TAXPAYER
IDENTIFICATION NUMBER, WRITE "EXEMPT" ON THE FACE OF THE FORM, SIGN AND DATE THE
FORM AND RETURN IT TO THE PAYER. IF YOU ARE A NONRESIDENT ALIEN OR A FOREIGN
ENTITY NOT SUBJECT TO BACKUP WITHHOLDING, FILE WITH A PAYER A COMPLETED INTERNAL
REVENUE FORM W-8 (CERTIFICATE OF FOREIGN STATUS).

  Certain payments other than interest, dividends, and patronage dividends, that
are not subject to information reporting are also not subject to backup
withholding. For details, see the regulations under Sections 6041, 6041A(a),
6042, 6044, 6045, 6049, 6050A and 6050N of the Code and the regulations
promulgated thereunder.

PRIVACY ACT NOTICE.--Section 6109 requires most recipients of dividend,
interest, or other payments to give taxpayer identification numbers to payers
who must report the payments to IRS. IRS uses the numbers for identification
purposes, and to help verify the accuracy of your tax return. The IRS may also
provide this information to the Department of Justice for civil and criminal
litigation and to cities, states, and the District of Columbia to carry out
their tax laws. Payers must be given the numbers whether or not recipients are
required to file tax returns. Payers must generally withhold 31% of taxable
interest, dividend, and certain other payments to a payee who does not furnish a
taxpayer identification number to a payer. Certain penalties may also apply.

PENALTIES
(1) PENALTY FOR FAILURE TO FURNISH TAXPAYER IDENTIFICATION NUMBER.--If you fail
to furnish your taxpayer identification number to a payer, you are subject to a
penalty of $50 for each such failure unless your failure is due to reasonable
cause and not to willful neglect.
(2) CIVIL PENALTY FOR FALSE INFORMATION WITH RESPECT TO WITHHOLDING.--If you
make a false statement with no reasonable basis which results in no imposition
of backup withholding, you are subject to a penalty of $500.
(3) CRIMINAL PENALTY FOR FALSIFYING INFORMATION.--Willfully falsifying
certifications or affirmations may subject you to criminal penalties including
fines and/or imprisonment.

                  FOR ADDITIONAL INFORMATION CONTACT YOUR TAX
                   CONSULTANT OR THE INTERNAL REVENUE SERVICE