diff --git a/Additional-Learning-Resources.md b/Additional-Learning-Resources.md
index 72c09f6..3f088ee 100644
--- a/Additional-Learning-Resources.md
+++ b/Additional-Learning-Resources.md
@@ -1,4 +1,3 @@
-
 ## Publications
 
 You can read more about PDF.js here:
@@ -18,6 +17,7 @@ Slides:
 + http://jviereck.github.com/slides/2012_07_berlinjs/index.html
 + https://people.mozilla.com/~cjones/PDF.js-mozilla-vision-japan-2012.pdf
 + https://people.mozilla.com/~ydelendik/pdfjs-ttf-2012.pdf
++ http://labs.appligent.com/presentations/recognizing_malformed_pdf_f.pdf
 
 ## PDF-related resources
 
@@ -31,4 +31,8 @@ The PDF specification itself:
 + http://www.adobe.com/devnet/acrobat/pdfs/PDF32000_2008.pdf
 + http://wwwimages.adobe.com/www.adobe.com/content/dam/Adobe/en/devnet/pdf/pdfs/pdf_reference_1-7.pdf
 
+## Related projects
+
+Open source projects:
++ http://poppler.freedesktop.org/