changed citation bibtex

README.md

@@ -78,11 +78,15 @@ On the fastMRI validation dataset:
 
 ## Bibtex entry
 ```
-@unpublished{ramzi:hal-03188997,
-  TITLE = {{NC-PDNet: a Density-Compensated Unrolled Network for 2D and 3D non-Cartesian MRI Reconstruction}},
-  AUTHOR = {Ramzi, Zaccharie and G R, Chaithya and Starck, Jean-Luc and Ciuciu, Philippe},
-  YEAR = {2021},
-  MONTH = Sep,
+@article{ramzi2022nc,
+  title={NC-PDNet: A density-compensated unrolled network for 2D and 3D non-Cartesian MRI reconstruction},
+  author={Ramzi, Zaccharie and Chaithya, GR and Starck, Jean-Luc and Ciuciu, Philippe},
+  journal={IEEE Transactions on Medical Imaging},
+  volume={41},
+  number={7},
+  pages={1625--1638},
+  year={2022},
+  publisher={IEEE}
 }
 ```