update citation information

README.md

@@ -1,5 +1,20 @@
-Code for the paper ["Finding Collisions for Round-Reduced Romulus-H"](https://eprint.iacr.org/2022/1630)
-========================================================================================================
+Code for the paper ["Finding Collisions for Round-Reduced Romulus-H"](https://doi.org/10.46586/tosc.v2023.i1.67-88)
+===================================================================================================================
+
+This repository contains the implementations of our attacks presented in our paper:
+
+```bibtex
+@article{tosc/NagelerPE23,
+    author = {Marcel Nageler and Felix Pallua and Maria Eichlseder},
+    title = {Finding Collisions for Round-Reduced {Romulus}-H},
+    journal = {{IACR} Trans. Symmetric Cryptol.},
+    number = {1},
+    volume = {2023},
+    pages = {67--88},
+    year = {2023},
+    doi = {10.46586/tosc.v2023.i1.67-88},
+}
+```
 
 
 ## Usage