diff --git a/references.bib b/references.bib
index 37688d5..49d7c77 100644
--- a/references.bib
+++ b/references.bib
@@ -918,7 +918,7 @@
 	booktitle = {Passive and Active Measurement Conference},
 	publisher = {Springer},
 	year = {2014},
-	url = {https://arxiv.org/pdf/1312.5739.pdf},
+	url = {https://arxiv.org/pdf/1312.5739v1.pdf},
 }
 
 @inproceedings{Espinoza2011a,
@@ -1219,7 +1219,7 @@
 	title = {Toward automatic censorship detection in microblogs},
 	booktitle = {Data Mining in Social Networks},
 	year = {2014},
-	url = {https://arxiv.org/pdf/1402.5310.pdf},
+	url = {https://arxiv.org/pdf/1402.5310v2.pdf},
 }
 
 @inproceedings{Nabi2013a,