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diff --git a/sub.bib b/sub.bib
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--- a/sub.bib
+++ b/sub.bib
@@ -129,3 +129,12 @@
   biburl    = {http://dblp.uni-trier.de/rec/bib/journals/jco/AgeevS04},
   bibsource = {dblp computer science bibliography, http://dblp.org}
 }
+
+@inproceedings{vondrak2008,
+  title={Optimal approximation for the submodular welfare problem in the value oracle model},
+  author={Vondr{\'a}k, Jan},
+  booktitle={Proceedings of the fortieth annual ACM symposium on Theory of computing},
+  pages={67--74},
+  year={2008},
+  organization={ACM}
+}