added link to the PWL singapore group, and an Game AI paper and the Google paper presented during the first meetup

README.md

@@ -11,8 +11,9 @@ Here are our official chapters. Let us know if you are interested in [starting o
 * [Colorado](http://www.meetup.com/Papers-We-Love-Boulder/)
 * [Ohio](http://www.meetup.com/Papers-We-Love-Columbus/)
 * [Berlin](http://www.meetup.com/Papers-We-Love-Berlin/)
-* [Pune] (http://www.meetup.com/Doo-Things)
+* [Pune](http://www.meetup.com/Doo-Things)
 * [Boston](http://www.meetup.com/Papers-We-Love-Boston/)
+* [Singapore](https://www.facebook.com/groups/paperswelovesg/)
 
 
 All of our meetups follow our [Code of Conduct](CODE_OF_CONDUCT.md).

information_retrieval/README.md

@@ -4,9 +4,8 @@ Information retrieval is the activity of obtaining information resources relevan
 
 The included documents are
 
-*
+* [Graph of Word and TW-IDF](http://www.lix.polytechnique.fr/~rousseau/papers/rousseau-cikm2013.pdf) - Francois Rousseau & Michalis Vazirgiannis
-  [Graph of Word and TW-IDF](http://www.lix.polytechnique.fr/~rousseau/papers/rousseau-cikm2013.pdf) - Francois Rousseau & Michalis Vazirgiannis
+
-  
   The traditional IR system stores term-specific statistics (typically
   a term's frequency in each document - which we call TF) in an index.
   Such a model ignores dependencies between terms and considers a
@@ -17,3 +16,5 @@ The included documents are
   TW statistic based on the graph constructed and achieve
   significantly better results that popular existing models. This
   paper won a honorable mention at CIKM 2013.
+
+* [The Anatomy of a Large-Scale Hypertextual Web Search Engine](http://infolab.stanford.edu/~backrub/google.html)