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diff --git a/sub.bib b/sub.bib
index 2c2e7d8..69e4703 100644
--- a/sub.bib
+++ b/sub.bib
@@ -153,3 +153,18 @@
     year = {2014},
     pages = {514--542}
 }
+
+@article{feige2011,
+  author    = {Uriel Feige and
+               Vahab S. Mirrokni and
+               Jan Vondr{\'{a}}k},
+  title     = {Maximizing Non-monotone Submodular Functions},
+  journal   = {{SIAM} Journal on Computing},
+  volume    = {40},
+  number    = {4},
+  pages     = {1133--1153},
+  year      = {2011},
+  timestamp = {Wed, 10 Aug 2011 12:19:12 +0200},
+  biburl    = {http://dblp.uni-trier.de/rec/bib/journals/siamcomp/FeigeMV11},
+  bibsource = {dblp computer science bibliography, http://dblp.org}
+}