Estesa la bibliografia con le guide Latex che ho usato

diff --git a/Bibliografia.tex b/Bibliografia.tex
index 8424543..c2b56f6 100644
--- a/Bibliografia.tex
+++ b/Bibliografia.tex
@@ -12,6 +12,20 @@
  \bibitem{demmel}{%
   Demmel,
   \emph{Applied Numeric Linear Algebra},
-
+  SIAM
+ }
+
+ \bibitem{lshort}{%
+  Tobias Oetiker, Hubert Partl, Irene Hyna and Elisabeth Schlegl,
+  \emph{The not so short introduction to \LaTeXe, or \LaTeXe in 139 minutes},
+  Scaricabile gratuitamente da Internet.
+ }
+
+ \bibitem{pgfmanual}{%
+  Till Tantau,
+ \emph{Tikz and PDF, Manual for version 1.10},
+ Institut f\"ur Theoretische Informatik
+ Universit\"at zu L\"ubeck,
+ October 26, 2006, \verb-http://sourceforge.net/projects/pgf-
  }
 \end{thebibliography}