ando citation for ddic

docs/paper/paper.bib

@@ -13,6 +13,17 @@
 	pages = {809--822}
 }
 
+@article{ando2012experimental,
+  title={Experimental micromechanics: grain-scale observation of sand deformation},
+  author={And{\`o}, Edward and Hall, SA and Viggiani, Gioacchino and Desrues, Jacques and B{\'e}suelle, Pierre},
+  journal={G{\'e}otechnique Letters},
+  volume={2},
+  number={3},
+  pages={107--112},
+  year={2012},
+  publisher={Thomas Telford Ltd}
+}
+
 @article{ando2019peek,
   title={A peek into the origin of creep in sand},
   author={And{\`o}, Edward and Dijkstra, Jelke and Roubin, Emmanuel and Dano, Christophe and Boller, Elodie},

docs/paper/paper.md

@@ -192,7 +192,7 @@ Currently, the most-used scripts are related to image correlation:
 `spam-ldic` is presented in the [scripts page](https://ttk.gricad-pages.univ-grenoble-alpes.fr/spam/scripts.html#regular-grid-local-dic-script-spam-ldic) and is the subject of the [DIC practice](https://ttk.gricad-pages.univ-grenoble-alpes.fr/spam/tutorial-02b-DIC-practice.html).
 `spam-regularStrain` is presented in the [scripts page](https://ttk.gricad-pages.univ-grenoble-alpes.fr/spam/scripts.html#regular-strain-script-spam-regularstrain) and is used in the [strain tutorial](https://ttk.gricad-pages.univ-grenoble-alpes.fr/spam/tutorial-07-strain.html)
 
-- `spam-ddic` and `spam-discreteStrain`: A "discrete" image correlation script [@hall2010discrete], working on greyscale 3D images plus a "labelled" image of the reference configuration. This script also has its own strain calculation based on a triangulation of grain centres.
+- `spam-ddic` and `spam-discreteStrain`: A "discrete" image correlation script [@hall2010discrete, @ando2012experimental], working on greyscale 3D images plus a "labelled" image of the reference configuration. This script also has its own strain calculation based on a triangulation of grain centres.
 `spam-ddic` is presented in the [scripts page](https://ttk.gricad-pages.univ-grenoble-alpes.fr/spam/scripts.html#discrete-local-dic-script-spam-ddic) and is the subject of the [discrete DIC tutorial](https://ttk.gricad-pages.univ-grenoble-alpes.fr/spam/tutorial-04-discreteDIC.html) 
 
 - `spam-gdic` (in beta test): A "global" image correlation script, where the displacement field between two 3D images is computed as a global problem expressed on a tetrahedral mesh.