SMP GC Papers

Hi all,
I have been doing some research on Garbage Collectors recently, mainly
about how they apply to games and with the language Lisp.

I was wondering if anyone could suggest some good SMP papers for me to
read. Links would be great. I have been reading Wilson's Uniprocessor
paper as well. I am interested in making Garbage Collection in Lisp
more effective for games or other real-time applications.

Thanks
Philip Haddad