add Kolditz2001 to bibliography

Documentation/bibliography.bib

-@book{Ericson:2004:RCD:1121584,
- author = {Ericson, Christer},
- title = {Real-Time Collision Detection (The Morgan Kaufmann Series in Interactive 3-D Technology) (The Morgan Kaufmann Series in Interactive 3D Technology)},
- year = {2004},
- isbn = {1558607323},
- publisher = {Morgan Kaufmann Publishers Inc.},
- address = {San Francisco, CA, USA},
-}
+% This file was created with JabRef 2.10b2.
+% Encoding: UTF-8
+
+
+@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)},
+  Author                   = {Ericson, Christer},
+  Publisher                = {Morgan Kaufmann Publishers Inc.},
\ No newline at end of file
+  Year                     = {2004},
+
+  Address                  = {San Francisco, CA, USA},
+
+  ISBN                     = {1558607323}
+}
+
+@Article{Kolditz2001,
+  Title                    = {{Non-linear flow in fractured rock}},
+  Author                   = {Kolditz , Olaf},
+  Journal                  = {International Journal of Numerical Methods for Heat \& Fluid Flow},
+  Year                     = {2001},
+  Number                   = {6},
+  Pages                    = {547--575},
+  Volume                   = {11},
+
+  Doi                      = {10.1108/EUM0000000005668},
+  ISSN                     = {0961-5539},
+  Keywords                 = {abstract this paper deals,at the geothermal research,darcian flow behavior was,finite elements,fractured rock,non-,non-linear dynamics,observed in pumping tests,of fluid flow in,pumps,site at soultz-,with theory and computation},
+  Owner                    = {localadmin},
+  Timestamp                = {2015.06.10},
+  Url                      = {http://www.emeraldinsight.com/journals.htm?articleid=877229\&show=abstract}
+}
+

NumLib/Fem/CoordinatesMapping/NaturalCoordinatesMapping.h

@@ -25,8 +25,7 @@ namespace NumLib
  *
  * This class also supports coordinates mapping of mixed dimensional elements,
  * e.g. line elements in 2D space. Details of the mapping method can be found in
- * Kolditz O (2001) Non-linear flow in fractured rock. International Journal of
- * Numerical Methods for Heat & Fluid Flow 11:547–575.
+ * \cite Kolditz2001 .
  *
  * @tparam T_MESH_ELEMENT       Mesh element type
  * @tparam T_SHAPE_FUNC         Shape function class