diff --git a/articles/Linear filter - Wikipedia/Linear filter - Wikipedia.pdf.txt b/articles/Linear filter - Wikipedia/Linear filter - Wikipedia.pdf.txt
new file mode 100644
index 0000000..8def5de
--- /dev/null
+++ b/articles/Linear filter - Wikipedia/Linear filter - Wikipedia.pdf.txt	
@@ -0,0 +1 @@
+https://en.wikipedia.org/w/index.php?title=Linear_filter&oldid=1190868650
diff --git a/articles/Linear filter - Wikipedia/Linear filter - Wikipedia.xopp.xml b/articles/Linear filter - Wikipedia/Linear filter - Wikipedia.xopp.xml
new file mode 100644
index 0000000..95ed963
--- /dev/null
+++ b/articles/Linear filter - Wikipedia/Linear filter - Wikipedia.xopp.xml	
@@ -0,0 +1,36 @@
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