diff --git a/python/damask/_colormap.py b/python/damask/_colormap.py
index 7e8860dae..d14503f5c 100644
--- a/python/damask/_colormap.py
+++ b/python/damask/_colormap.py
@@ -27,12 +27,14 @@ class Colormap(mpl.colors.ListedColormap):
 
     References
     ----------
-    [1] DAMASK colormap theory
-      https://www.kennethmoreland.com/color-maps/ColorMapsExpanded.pdf
-    [2] DAMASK colormaps first use
-      https://doi.org/10.1016/j.ijplas.2012.09.012
-    [3] Matplotlib colormaps overview
-      https://matplotlib.org/tutorials/colors/colormaps.html
+    K. Moreland, Proceedings of the 5th International Symposium on Advances in Visual Computing, 2009
+    http://dx.doi.org/10.1007/978-3-642-10520-3_9
+
+    P. Eisenlohr et al., International Journal of Plasticity 46:37–53, 2013
+    https://doi.org/10.1016/j.ijplas.2012.09.012
+
+    Matplotlib colormaps overview
+    https://matplotlib.org/tutorials/colors/colormaps.html
 
     """
 
diff --git a/src/grid/spectral_utilities.f90 b/src/grid/spectral_utilities.f90
index e8bae223a..97801cfb3 100644
--- a/src/grid/spectral_utilities.f90
+++ b/src/grid/spectral_utilities.f90
@@ -176,16 +176,16 @@ subroutine spectral_utilities_init
 
   print'(/,a)', ' <<<+-  spectral_utilities init  -+>>>'
 
-  print*, 'Diehl, Diploma Thesis TU München, 2010'
+  print*, 'M. Diehl, Diploma Thesis TU München, 2010'
   print*, 'https://doi.org/10.13140/2.1.3234.3840'//IO_EOL
 
-  print*, 'Eisenlohr et al., International Journal of Plasticity 46:37–53, 2013'
+  print*, 'P. Eisenlohr et al., International Journal of Plasticity 46:37–53, 2013'
   print*, 'https://doi.org/10.1016/j.ijplas.2012.09.012'//IO_EOL
 
-  print*, 'Shanthraj et al., International Journal of Plasticity 66:31–45, 2015'
+  print*, 'P. Shanthraj et al., International Journal of Plasticity 66:31–45, 2015'
   print*, 'https://doi.org/10.1016/j.ijplas.2014.02.006'//IO_EOL
 
-  print*, 'Shanthraj et al., Handbook of Mechanics of Materials, 2019'
+  print*, 'P. Shanthraj et al., Handbook of Mechanics of Materials, 2019'
   print*, 'https://doi.org/10.1007/978-981-10-6855-3_80'
 
 !--------------------------------------------------------------------------------------------------