diff --git a/Doc/images/mesh.inner.png b/Doc/images/mesh.inner.png
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Binary files /dev/null and b/Doc/images/mesh.inner.png differ
diff --git a/Doc/images/mesh.normal.png b/Doc/images/mesh.normal.png
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Binary files /dev/null and b/Doc/images/mesh.normal.png differ
diff --git a/Doc/images/mesh.outer.png b/Doc/images/mesh.outer.png
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diff --git a/Doc/images/src/mesh.inner.tex b/Doc/images/src/mesh.inner.tex
new file mode 100644
index 00000000..a8faf53a
--- /dev/null
+++ b/Doc/images/src/mesh.inner.tex
@@ -0,0 +1,48 @@
+\documentclass{minimal}
+
+% Tikz
+\usepackage{pgf}
+\usepackage{tikz}
+
+\begin{document}
+
+\begin{center}
+ \begin{tikzpicture}
+ [
+ 	vertex/.style={draw=none,circle,fill=black,minimum size=2pt},
+	oedge/.style={->,>=latex,shorten >=6pt,draw,black,thick},
+	roedge/.style={->,>=latex,shorten >=6pt,draw,black,thick,color=red}
+ ]
+
+\coordinate (V1) at (-3,3);
+\coordinate (V2) at (0,0);
+\coordinate (V3) at (0,6);
+\coordinate (V4) at (3,3);
+
+\path[roedge] ([yshift=3pt]V1) to ([yshift=3pt]V2) {};
+\path[oedge] ([yshift=-3pt]V2) to ([yshift=-3pt]V1) {};
+
+\path[oedge] ([yshift=3pt]V1) -- ([yshift=3pt]V3) {};
+\path[roedge] ([yshift=-3pt]V3) -- ([yshift=-3pt]V1) {};
+
+\path[oedge] ([xshift=2pt]V3) -- ([xshift=2pt]V2) {};
+\path[roedge] ([xshift=-2pt]V2) -- ([xshift=-2pt]V3) {};
+
+\path[oedge] ([yshift=3pt]V2) -- ([yshift=3pt]V4) {};
+\path[oedge] ([yshift=-3pt]V4) -- ([yshift=-3pt]V2) {};
+
+\path[oedge] ([yshift=3pt]V3) -- ([yshift=3pt]V4) {};
+\path[oedge] ([yshift=-3pt]V4) -- ([yshift=-3pt]V3) {};
+
+\node[vertex] at (V1) {};
+\node[vertex] at (V2) {};
+\node[vertex] at (V3) {};
+\node[vertex] at (V4) {};
+
+\draw[->,>= latex,thick] (-0.4,3) arc (0:320:20pt);
+
+
+\end{tikzpicture}
+\end{center}
+
+\end{document}
diff --git a/Doc/images/src/mesh.normal.tex b/Doc/images/src/mesh.normal.tex
new file mode 100644
index 00000000..fac97cb9
--- /dev/null
+++ b/Doc/images/src/mesh.normal.tex
@@ -0,0 +1,48 @@
+\documentclass{minimal}
+
+% Tikz
+\usepackage{pgf}
+\usepackage{tikz}
+
+\begin{document}
+
+\begin{center}
+ \begin{tikzpicture}
+ [
+ 	vertex/.style={draw=none,circle,fill=black,minimum size=2pt},
+	oedge/.style={->,>=latex,shorten >=6pt,draw,black,thick},
+	roedge/.style={->,>=latex,shorten >=6pt,draw,black,thick,color=red}
+ ]
+
+\coordinate (V1) at (-3,3);
+\coordinate (V2) at (0,0);
+\coordinate (V3) at (0,6);
+\coordinate (V4) at (3,3);
+
+\path[oedge] ([yshift=3pt]V1) to ([yshift=3pt]V2) {};
+\path[oedge] ([yshift=-3pt]V2) to ([yshift=-3pt]V1) {};
+
+\path[oedge] ([yshift=3pt]V1) -- ([yshift=3pt]V3) {};
+\path[oedge] ([yshift=-3pt]V3) -- ([yshift=-3pt]V1) {};
+
+\path[oedge] ([xshift=2pt]V3) -- ([xshift=2pt]V2) {};
+\path[oedge] ([xshift=-2pt]V2) -- ([xshift=-2pt]V3) {};
+
+\path[oedge] ([yshift=3pt]V2) -- ([yshift=3pt]V4) {};
+\path[oedge] ([yshift=-3pt]V4) -- ([yshift=-3pt]V2) {};
+
+\path[oedge] ([yshift=3pt]V3) -- ([yshift=3pt]V4) {};
+\path[oedge] ([yshift=-3pt]V4) -- ([yshift=-3pt]V3) {};
+
+\node[vertex] at (V1) {};
+\node[vertex] at (V2) {};
+\node[vertex] at (V3) {};
+\node[vertex] at (V4) {};
+
+%\draw[->, thick] (-0.4,3) arc (0:320:20pt);
+
+
+\end{tikzpicture}
+\end{center}
+
+\end{document}
diff --git a/Doc/images/src/mesh.outer.tex b/Doc/images/src/mesh.outer.tex
new file mode 100644
index 00000000..82b6d710
--- /dev/null
+++ b/Doc/images/src/mesh.outer.tex
@@ -0,0 +1,48 @@
+\documentclass{minimal}
+
+% Tikz
+\usepackage{pgf}
+\usepackage{tikz}
+
+\begin{document}
+
+\begin{center}
+ \begin{tikzpicture}
+ [
+ 	vertex/.style={draw=none,circle,fill=black,minimum size=2pt},
+	oedge/.style={->,>=latex,shorten >=6pt,draw,black,thick},
+	roedge/.style={->,>=latex,shorten >=6pt,draw,black,thick,color=red}
+ ]
+
+\coordinate (V1) at (-3,3);
+\coordinate (V2) at (0,0);
+\coordinate (V3) at (0,6);
+\coordinate (V4) at (3,3);
+
+\path[oedge] ([yshift=3pt]V1) to ([yshift=3pt]V2) {};
+\path[roedge] ([yshift=-3pt]V2) to ([yshift=-3pt]V1) {};
+
+\path[roedge] ([yshift=3pt]V1) -- ([yshift=3pt]V3) {};
+\path[oedge] ([yshift=-3pt]V3) -- ([yshift=-3pt]V1) {};
+
+\path[oedge] ([xshift=2pt]V3) -- ([xshift=2pt]V2) {};
+\path[oedge] ([xshift=-2pt]V2) -- ([xshift=-2pt]V3) {};
+
+\path[oedge] ([yshift=3pt]V2) -- ([yshift=3pt]V4) {};
+\path[roedge] ([yshift=-3pt]V4) -- ([yshift=-3pt]V2) {};
+
+\path[roedge] ([yshift=3pt]V3) -- ([yshift=3pt]V4) {};
+\path[oedge] ([yshift=-3pt]V4) -- ([yshift=-3pt]V3) {};
+
+\node[vertex] at (V1) {};
+\node[vertex] at (V2) {};
+\node[vertex] at (V3) {};
+\node[vertex] at (V4) {};
+
+\draw[<-,>= latex,thick] (3.3,3) arc (0:320:94pt);
+
+
+\end{tikzpicture}
+\end{center}
+
+\end{document}