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@@ -94,4 +94,5 @@ formatted for mate-tools usage in `./bilaterla-srl/tools/mate-tools/sl.{test,tra
 ## Sources
 * [1] (mate-tools) https://code.google.com/archive/p/mate-tools/
 * [2] (benchmarking) https://github.com/clarinsi/bilateral-srl
-
+* [3] (conll 2008 paper) http://www.aclweb.org/anthology/W08-2121.pdf
+* [4] (format CoNLL 2009) https://wiki.ufal.ms.mff.cuni.cz/format-conll
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