Update README.md

README.md

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-license: cc-by-nc-nd-4.0
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+---
+license: cc-by-nc-nd-4.0
+---
+
+`xvr-data` contains DICOM/NIfTI versions of the `DeepFluoro` and `Ljubljana` datasets. If you use either of these datasets, please cite the original papers.
+
+    @article{grupp2020automatic,
+      title={Automatic annotation of hip anatomy in fluoroscopy for robust and efficient 2D/3D registration},
+      author={Grupp, Robert B and Unberath, Mathias and Gao, Cong and Hegeman, Rachel A and Murphy, Ryan J and Alexander, Clayton P and Otake, Yoshito and McArthur, Benjamin A and Armand, Mehran and Taylor, Russell H},
+      journal={International journal of computer assisted radiology and surgery},
+      volume={15},
+      pages={759--769},
+      year={2020},
+      publisher={Springer}
+    }
+
+    @article{pernus20133d,
+      title={3D-2D registration of cerebral angiograms: A method and evaluation on clinical images},
+      author={Mitrović, Uros˘ and S˘piclin, Z˘iga and Likar, Bos˘tjan and Pernus˘, Franjo},
+      journal={IEEE transactions on medical imaging},
+      volume={32},
+      number={8},
+      pages={1550--1563},
+      year={2013},
+      publisher={IEEE}
+    }