[Haskell-cafe] Looking for lost library

[Gracjan Polak]

Hi,

Sorry for stupid question, but...

Some time ago I read a beautiful paper about variables that had their 
dependencies automatically tracked and could trigger recalculation when 
changed.  Prototype was implemented in OCaml, then reimplemented in 
Haskell (using monads). I would like to read that paper once again, 
but... I lost it :(

I do not remember neither title, nor authors. Google asked about any 
keywords that come to my mind do not show any interesting results. So I 
ask here :)

Can anybody help me, please? Thanks for any pointers...

-- 
Gracjan