<PAGE>
Rule 424(b)(3)
Registration No. 333-6477
PROSPECTUS SUPPLEMENT DATED MARCH 3, 1997
TO PROSPECTUS DATED SEPTEMBER 18, 1996
The Selling Holders table on pages 57 and 58 of the Prospectus is
hereby amended to add the following entities and their respective principal
amount of Securities and number of Conversion Shares:
<TABLE>
<CAPTION>
Principal Amount Number of
of Securities Conversion Shares
---------------- -----------------
<S> <C> <C>
Selling Holders
Zazove Convertible Fund, L.P............................................... 500,000 7,692
Catholic Mutual Relief Society Pension Plan and Trust...................... 425,000 6,538
Catholic Mutual Relief Society of America.................................. 275,000 4,230
</TABLE>
The second to last line of the Selling Holders table on page 58 of the
Prospectus is hereby deleted and the following is added in lieu thereof:
<TABLE>
<S> <C>
Other Selling Holders (10)................................................. 275,000 4,230
</TABLE>
