add new paper

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 - [Democratic Diffusion Aggregation for ImageRetrieval]()
 - [A Vote-and-Verify Strategy for Fast Spatial Verification in Image Retrieval]()
 - [Triangulation embedding and democratic aggregation for image search]()
+- [Efficient Large-scale Image Search With a Vocabulary Tree](http://www.ipol.im/pub/art/2018/199/), [code](https://github.com/fragofer/voctree)

 #### Deep Learning Feature (Global Feature)