add reference

SimonBlanke · Sep 24, 2019 · 4ced508 · 4ced508
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diff --git a/README.md b/README.md
@@ -219,6 +219,7 @@ Inspired by hyperband optimization.
 ## References
 
 #### [1] [Proxy Datasets for Training Convolutional Neural Networks](https://arxiv.org/pdf/1906.04887v1.pdf)
+#### [2] [An Empirical Investigation of Catastrophic Forgetting in Gradient-Based Neural Networks](https://arxiv.org/pdf/1312.6211.pdf)
 
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