Added bib reference to first benchmark book.

Documentation/bibliography.bib

@@ -14,7 +14,7 @@
 }
 
 @Book{Ericson:2004:RCD:1121584,
-  Title                    = {Real-Time Collision Detection (The Morgan Kaufmann Series in Interactive 3-D Technology) (The Morgan Kaufmann Series in Interactive 3D Technology)},
+  Title                    = {Real-Time Collision Detection (The Morgan Kaufmann Series in Interactive 3-D Technology)},
   Author                   = {Ericson, Christer},
   Publisher                = {Morgan Kaufmann Publishers Inc.},
   Year                     = {2004},
@@ -90,6 +90,16 @@
   Url                      = {http://www.sciencedirect.com/science/article/pii/S0045794902004157}
 }
 
+@book{Kolditz2012,
+  title = "Thermo-Hydro-Mechanical-Chemical Processes in Porous Media - Benchmarks and Examples",
+  author = "{Kolditz}, O. and {G{\"o}rke}, U.-J. and Shao, H. and Wang, W.",
+  publisher = "Springer",
+  year = "2012",
+  volume = "86",
+  doi = "10.1007/978-3-642-27177-9",
+  isbn = "978-3-642-27176-2"
+}
+
 @article{Parisio2017,
   title = "Plastic-damage modeling of saturated quasi-brittle shales ",
   journal = "International Journal of Rock Mechanics and Mining Sciences ",