Looking for a reference in the Boston Globe about October 2003 to the
work of Dr. Michael Davis on D-cycloserine potentiating exposure and
extinction.

I believe your article is this one:

Boston Globe: CAN DRUGS HELP US CONQUER PHOBIAS?
http://www.boston.com/yourlife/health/mental/articles/2003/10/28/can_drugs_help_us_conquer_phobias/

Here are four other articles on the subject that you may find interesting:

Science News: Fear Not
http://www.sciencenews.org/articles/20040117/bob9.asp

Doctor's Guide: D-cycloserine May Give New Boost to Phobia Psychotherapy
http://www.pslgroup.com/dg/23e54e.htm

Emory Report: Davis scaring out causes and cures for phobias 
http://www.emory.edu/EMORY_REPORT/erarchive/2002/June/erJune.24/6_24_02davis.html

Innovations Report: Advances in understanding the basis of fear extinction 
http://www.innovations-report.com/html/reports/studies/report-23208.html

Google Web Search: "D-cycloserine" + "michael davis" + "extinction"
://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=%22D-cycloserine%22+%22michael+davis%22+extinction

I hope this helps. If the Boston Globe article is not the correct one,
please let me know so that I can resume the search. I'll be glad to
offer further assistance before you rate my answer.

Best regards,
pinkfreud