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diff --git a/paper/sparse.bib b/paper/sparse.bib
index 48017cc..6cebf03 100644
--- a/paper/sparse.bib
+++ b/paper/sparse.bib
@@ -371,3 +371,32 @@ year = "2009"
   pages = {026--107},
   year = {2002}
 }
+
+
+@article{watts:1998,
+  Annote = {10.1038/30918},
+  Author = {Watts, Duncan J. and Strogatz, Steven H.},
+  Date = {1998/06/04/print},
+  Isbn = {0028-0836},
+  Journal = {Nature},
+  Number = {6684},
+  Pages = {440--442},
+  Read = {0},
+  Title = {Collective dynamics of `small-world' networks},
+  Url = {http://dx.doi.org/10.1038/30918},
+  Volume = {393},
+  Year = {1998},
+}
+
+@article{barabasi:2001,
+  author    = {R{\'{e}}ka Albert and
+               Albert{-}L{\'{a}}szl{\'{o}} Barab{\'{a}}si},
+  title     = {Statistical mechanics of complex networks},
+  journal   = {CoRR},
+  volume    = {cond-mat/0106096},
+  year      = {2001},
+  url       = {http://arxiv.org/abs/cond-mat/0106096},
+  timestamp = {Mon, 05 Dec 2011 18:05:15 +0100},
+  biburl    = {http://dblp.uni-trier.de/rec/bib/journals/corr/cond-mat-0106096},
+  bibsource = {dblp computer science bibliography, http://dblp.org}
+}