finding packages installed from a 3rd party repository

hi all
I'm trying to find all packages i installed from a certain 3rd party repository, as i think they are causing some instability.
i suspect there is something in the apt toolkit, but I'm not sure what it is. any pointers? :)
kk

--
Karl Goetz
The buck stops there -> $
Australian Ubuntu users team - http://wiki.ubuntu.com/AustralianTeam

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