update 16

bibliography.bib

@@ -6055,6 +6055,20 @@ pages ={157-166},
   publisher = {Annual Meeting of the Association for Computational Linguistics},
   year      = {2019}
 }
+@article{2015OnGulcehre,
+  title = {On Using Monolingual Corpora in Neural Machine Translation},
+  author = { Gulcehre Caglar  and  
+           Firat Orhan  and  
+           Xu Kelvin  and  
+           Cho Kyunghyun  and  
+           Barrault Loic  and  
+           Lin Huei Chi  and  
+           Bougares Fethi  and  
+           Schwenk Holger  and  
+           Bengio  Yoshua },
+  journal = {Computer Science},
+  year = {2015},
+}
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