diff --git a/paper/paper.bib b/paper/paper.bib
index cc829d6..491919c 100644
--- a/paper/paper.bib
+++ b/paper/paper.bib
@@ -13,7 +13,7 @@ @misc{Oliphant2007
 year = {2007}
 }
 
-@article{Stéfan van der Walt2011,
+@article{Stefan2011,
 author = {Stéfan van der Walt and S. Chris Colbert and Gaël Varoquaux},
 title = {The NumPy Array: A Structure for Efficient Numerical Computation},
 journal = {Computing in Science \& Engineering},
diff --git a/paper/paper.md b/paper/paper.md
index 0b593c6..144763f 100644
--- a/paper/paper.md
+++ b/paper/paper.md
@@ -39,7 +39,7 @@ online database. [Evaluated Nuclear Data File
 (ENDF/B)](http://www.nndc.bnl.gov/exfor/endf00.jsp) [@Chadwick2011] is currently
 supported and more evaluated databases will be added in future.
 
-Python packages used are: SciPy [@Oliphant2007], NumPy [@Stéfan van der Walt2011], 
+Python packages used are: SciPy [@Oliphant2007], NumPy [@Stefan2011], 
 Matplotlib [@Hunter2007], Pandas [@McKinney2010] and Periodictable [@kienzle_p_a_2017_840347].
 
 The energy dependent cross-section data used in this library are from