how to extract overlap from non-dissolved buffer zones in qgis 1.7.4

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I have a shapefile with the inventory of all limetree in a region. I made a buffer around each tree. So, the place where buffers overlap each other is the best place to put beehives.

Is there a way to extract the overlap between non-dissolved buffers in the same layer? Or is there another way?

Thanks for the help.Pieter



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