Adición de bibliografía

bibliografia/bibliografia.bib

@@ -1241,10 +1241,21 @@
   url       = {http://libgen.io/book/index.php?md5=3729239F0DFD43FE584D91928058011B},
 }
 
+@MastersThesis{crossland2008a,
+  author   = {Crossland, David},
+  title    = {The Free Font Movement},
+  school   = {University of Reading},
+  year     = {2008},
+  file     = {:recursos/crossland2008a.pdf:PDF},
+  groups   = {Secundaria},
+  keywords = {Secundaria},
+  url      = {http://understandingfonts.com/wp-content/uploads/2015/03/dave_crossland_matd2008_dissertation.pdf},
+}
+
 @Comment{jabref-meta: databaseType:bibtex;}
 
-@Comment{jabref-meta: groupstree:
+@Comment{jabref-meta: grouping:
 0 AllEntriesGroup:;
-1 ExplicitGroup:Primaria\;0\;;
-1 ExplicitGroup:Secundaria\;0\;;
+1 StaticGroup:Primaria\;0\;1\;\;\;\;;
+1 StaticGroup:Secundaria\;0\;1\;\;\;\;;
 }