Several changes in documentaion

section grid dispersion had mistakes in it.
removed outdated parts.

doc/guide_sofi3D/tex/thesis.bib

@@ -588,6 +588,24 @@ http://www.fz-juelich.de/ias/jsc/EN/Expertise/Supercomputers/JUROPA/JUROPA_node.
    NUMBER = 1,
    PAGES = {5--8} }
 
+@ARTICLE{courant:28,
+   author = {Courant, {R.} and Friedrichs, {K.} and Lewy, {H.}},
+   journal = {Mathematische Annalen},
+   title = {{\"U}ber die partiellen {D}ifferenzen\-gleichungen der mathematischen {P}hysik},
+   volume = {100},
+   pages = {32-74},
+   year ={1928}
+}
+
+@ARTICLE{courant:67,
+   author = {Courant, {R.} and Friedrichs, {K.} and Lewy, {H.}},
+   journal = {IBM Journal},
+   title = {On the partial difference equations of mathematical physics},
+   pages = {215-234},
+   year ={March 1967}
+}
+
+
 @article{coutant:95,
    AUTHOR = {Coutant, {O.} and Virieux, {J.} and Zollo, {A.}},
    TITLE = {Numerical Source Implementation in a 2D Finite Difference Scheme for