diff --git a/intermediate_source/seq2seq_translation_tutorial.py b/intermediate_source/seq2seq_translation_tutorial.py
index 587d5edfe94..fe233e59343 100644
--- a/intermediate_source/seq2seq_translation_tutorial.py
+++ b/intermediate_source/seq2seq_translation_tutorial.py
@@ -521,7 +521,7 @@ def tensorsFromPair(pair):
 # each next input, instead of using the decoder's guess as the next input.
 # Using teacher forcing causes it to converge faster but `when the trained
 # network is exploited, it may exhibit
-# instability <http://minds.jacobs-university.de/sites/default/files/uploads/papers/ESNTutorialRev.pdf>`__.
+# instability <http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.378.4095&rep=rep1&type=pdf>`__.
 #
 # You can observe outputs of teacher-forced networks that read with
 # coherent grammar but wander far from the correct translation -