# HG changeset patch
# User Christian Urban <christian dot urban at kcl dot ac dot uk>
# Date 1473763762 -3600
# Node ID ecb5e4d58513c506acd1b697750bd16b4d4b00f3
# Parent  c592ea0661aeeeb273c25628560c32b0a34459af
added backreference papers

diff -r c592ea0661ae -r ecb5e4d58513 Literature/backref-automata.pdf
Binary file Literature/backref-automata.pdf has changed
diff -r c592ea0661ae -r ecb5e4d58513 Literature/backref-komandansky.pdf
Binary file Literature/backref-komandansky.pdf has changed
diff -r c592ea0661ae -r ecb5e4d58513 Literature/backref-singlecharacter.pdf
Binary file Literature/backref-singlecharacter.pdf has changed
diff -r c592ea0661ae -r ecb5e4d58513 TODO
--- a/TODO	Wed Aug 24 11:30:46 2016 +0100
+++ b/TODO	Tue Sep 13 11:49:22 2016 +0100
@@ -1,1 +1,7 @@
 Regular Path Queries & regular expressions
+
+
+------
+about extended regular expressions
+  http://www.ddfy.de/
+  http://perl.plover.com/NPC/
\ No newline at end of file