fix doc

tools/mesh/unstructured.py

@@ -1232,7 +1232,7 @@ def interpolateDisplacementsOnGrid(ns, points, displacements, imShape=None, nNei
     a discrete field.
     This is similar to the approach used in (which uses triangular
     shape functions to interpolate displacements):
-        Desrues, J., & Viggiani, G. (2004). Strain localization in sand: an overview of the experimental results obtained in Grenoble using stereophotogrammetry. International Journal for Numerical and Analytical Methods in Geomechanics, 28(4), 279-321.
+    Desrues, J., & Viggiani, G. (2004). Strain localization in sand: an overview of the experimental results obtained in Grenoble using stereophotogrammetry. International Journal for Numerical and Analytical Methods in Geomechanics, 28(4), 279-321.
 
     Parameters
     ----------