diff --git a/CITATION.cff b/CITATION.cff
index 1568379..6be888f 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -21,6 +21,11 @@ authors:
   
 title: "Pychastic: Precise Brownian Dynamics using Taylor-Ito integrators in Python"
 
-doi: 10.48550/arXiv.2209.04332
+doi: 10.21468/SciPostPhysCodeb.11
 date-released: 2022-09-09
-url: "https://github.com/RadostW/PyGRPY"
+url: "https://scipost.org/10.21468/SciPostPhysCodeb.11"
+
+publisher: SciPost
+pages: 11
+year: 2023
+journal: SciPost Phys. Codebases
diff --git a/pygrpy/grpy_tensors.py b/pygrpy/grpy_tensors.py
index 7d7b25f..f847d86 100644
--- a/pygrpy/grpy_tensors.py
+++ b/pygrpy/grpy_tensors.py
@@ -2,7 +2,6 @@
 import numpy as np
 import scipy as sp
 import scipy.linalg
-import json
 
 _epsilon = np.array([[[0,0,0],[0,0,1],[0,-1,0]],[[0,0,-1],[0,0,0],[1,0,0]],[[0,1,0],[-1,0,0],[0,0,0]]]) #levi-civita(3)