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--- a/si/n.lyx
+++ b/si/n.lyx
@@ -192,6 +192,59 @@ And–or tree
 .
 \end_layout
 
+\begin_layout Itemize
+
+\lang english
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+begin{sloppypar}
+\end_layout
+
+\end_inset
+
+G.
+ Veera Raghavaiah
+\lang spanish
+ (2010).
+ 
+\emph on
+\lang english
+Problem Reduction with AO* Algorithm
+\emph default
+\lang spanish
+ (
+\begin_inset Flex URL
+status open
+
+\begin_layout Plain Layout
+
+https://artificialintelligence-notes.blogspot.com/2010/07/problem-reduction-with-a
+o-algorithm.html
+\end_layout
+
+\end_inset
+
+).
+\begin_inset ERT
+status open
+
+\begin_layout Plain Layout
+
+
+\backslash
+end{sloppypar}
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
 \begin_layout Chapter
 Introducción
 \end_layout