add references

doc/yade-articles.bib

@@ -464,6 +464,28 @@ @article{Scholtes2013
 	url = {http://dx.doi.org/10.1016/j.jmps.2012.10.005}
 }
 
+@article{Scholtes2015a,
+  title={Modeling wave-induced pore pressure and effective stress in a granular seabed},
+  author={Scholt{\`e}s, L. and Chareyre, B. and Michallet, H. and Catalano, E. and Marzougui, D.},
+  journal={Continuum Mechanics and Thermodynamics},
+  volume={27},
+  number={1},
+  pages={305--323},
+  year={2015},
+  doi={http://dx.doi.org/10.1007/s00161-014-0377-2}
+}
+
+@article{Scholtes2015b,
+  title={A DEM analysis of step-path failure in jointed rock slopes},
+  author={Scholt{\`e}s, L. and Donz{\'e}, F., V.},
+  journal={Comptes rendus - M{\'e}canique},
+  volume={343},
+  number={2},
+  pages={155--165},
+  year={2015},
+  doi={http://dx.doi.org/10.1016/j.crme.2014.11.002}
+}
+
 @article{Shiu2008,
   	title={Compaction process in concrete during missile impact: a DEM analysis},
   	author={Shiu, W. and Donzé, F.V. and Daudeville, L.},