Thermics.md

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-Magnetostatic electromagnet
+Thermal problem with contact resistances and floating temperature
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@@ -29,7 +29,7 @@ and click on the "Run" button in the left panel.
 
 ## Features addressed in this tutorial
 
-  * Contact thermal resistance (idealised thin region with hign thermal conductivity)
+  * Contact thermal resistance (idealized thin region with high thermal conductivity)
   * Thermal electrode (floating temperature in a region of high thermal conductivity)
   * Computation of heat flux through surfaces
   * Import of a source field from a file
@@ -43,7 +43,8 @@ on different parts of the surface of the brick.
 The model is rather academic but it
 demonstrates some useful high-level GetDP features. 
 
-The floating potential idea (introduced in tutorial 4)
+The floating potential idea 
+(introduced in [tutorial 4](Electrostatics-with-floating-potentials))
 is reconsidered here in a thermal context to represent a region
 with a very large thermal conductivity where, consequently, 
 the temperature field is uniform (exactly like the electric potential