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, any
                                      one of the
                                      individuals(2)
 3.  Husband and wife (joint          The actual owner of
     account)                         the account or, if
                                      joint funds, the first
                                      individual on the
                                      account(1)
 4.  Custodian account of a minor     The minor(2)
     (Uniform Gift to Minors Act)
 5.  Adult and minor (joint account)  The adult or, if the
                                      minor is the only
                                      contributor, the
                                      minor(1)
 6.  Account in the name of guardian  The ward, minor, or
     or committee for a designated    incompetent person(3)
     ward, minor, or incompetent
     person
 7.  a. The usual revocable savings   The grantor-trustee(1)
        trust account (grantor is
        also trustee)
     b. So-called trust account that  The actual owner(1)
        is not a legal or valid
        trust under State law
 8.  Sole proprietorship account      The owner(4)
- ------------------------------------------------------------




- ------------------------------------------------------------
                                        GIVE THE EMPLOYER
                                          IDENTIFICATION
     FOR THIS TYPE OF ACCOUNT:             NUMBER OF --
- ------------------------------------------------------------
                                

 9.  A valid trust, estate, or        The legal entity (do
     pension trust                    not furnish the
                                      identifying number of
                                      the personal
                                      representative or
                                      trustee unless the
                                      legal entity itself is
                                      not designated in the
                                      account title)(5)

10.  Corporate account                The corporation

11.  Religious, charitable, or        The organization
     educational organization
     account

12.  Partnership account held in the  The partnership
     name of the business

13.  Association, club, or other      The organization
     tax-exempt organization

14.  A broker or registered nominee   The broker or nominee

15.  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) Circle the ward's, minor's or incompetent person's name and furnish such
    person's social security number.
(4) Show the name of the owner.
(5) 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.
   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 ("TIN") or you don't know
your number, obtain, as appropriate, either a Form SS-5, Application for a
Social Security Number Card, or Form SS-4, Application for Employer
Identification Number, or a Form W-7 for Individual Taxpayer Identification
Number (for alien individuals required to file U.S. tax returns) 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 dividend and
interest payments and on broker transactions include the following:
  - A corporation.
  - A financial institution.
  - An organization exempt from tax under Section 501(a), or an individual
    retirement plan, or a custodian account under Section 403(b)(7) if the
    account satisfies the requirements of Section 401(f)(2).
  - The United States or any agency or instrumentality thereof.
  - A State, the District of Columbia, a possession of the United States, or any
    subdivision or instrumentality thereof.
  - An international organization or any agency or instrumentality thereof.
  - A registered dealer in securities or commodities registered in the United
    States or a possession of the United States.
  - A real estate investment trust.
  - A common trust fund operated by a bank under Section 584(a).
  - An entity registered at all times under the Investment Company Act of 1940.
  - A foreign central bank of issue.
  Payments of dividends and patronage dividends not generally subject to backup
withholding include the following:
  - Payments to nonresident aliens subject to withholding under Section 1441.
  - Payments to partnerships not engaged in a trade or business in the United
    States and which have at least one nonresident alien partner.
  - Payments of patronage dividends where the amount received is not paid in
    money.
  - Payments made by certain foreign organizations.
  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).
  - Payments described in Section 6049(b)(5) to nonresident aliens.
  - Payments on tax-free covenant bonds under Section 1451.
  - Payments made by certain foreign organizations.
Exempt payees described above should file Form W-9 to avoid possible erroneous
backup withholding. Complete the Substitute Form W-9 as follows: ENTER YOUR
TAXPAYER IDENTIFICATION NUMBER, WRITE "EXEMPT" ON THE FACE OF THE FORM, SIGN,
DATE, AND RETURN IT TO THE PAYER.

  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 and the regulations 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. The IRS uses the numbers for identification
purposes and to help verify the accuracy of tax reforms. 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 correct 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) 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.
(4) MISUSE OF TAXPAYER IDENTIFICATION NUMBERS. -- If the payer discloses or uses
taxpayer identification numbers in violation of Federal law, the payer may be
subject to civil and criminal penalties.

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