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> Everybody refers to reference counting as
> though it cannot catch cyclic structures.
> Rafael Lins, whom I believe is now in the
> Departamento de Electronica e Sistemas at
> the Universidade de Pernambuco, produced
> some beautiful gc reference counting
> algorithms that do catch cyclic structures.
> See "Cyclic Reference Counting with Lazy
> Mark-Scan", UKC Technical Report 75
> (1991). 

Well it can't, hence you have to use another algorithm to catch the
cyclic references!

I put the paper up on the wiki in PDF if anyone would like to read it:
(I assumed PDF is everyones format of choice).