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@mdinitz Rothvoß used SDP hierarchies to approximate directed steiner tree: http://t.co/wnjys68q7i (though see http://t.co/WsbcHmOTw8)
@mdinitz Rothvoß used SDP hierarchies to approximate directed steiner tree: http://t.co/wnjys68q7i (though see http://t.co/WsbcHmOTw8)