From f21ca0dc1956a47b8f7ac6e0ea67d7d246c55280 Mon Sep 17 00:00:00 2001
From: Eduardo Julian
Date: Mon, 6 Jun 2022 01:17:43 -0400
Subject: Added extensions to JS interop for working with "undefined" values.

---
 documentation/bookmark/math/geometry/geometric_algebra.md | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'documentation/bookmark/math/geometry')

diff --git a/documentation/bookmark/math/geometry/geometric_algebra.md b/documentation/bookmark/math/geometry/geometric_algebra.md
index b83e0c698..2de56f32f 100644
--- a/documentation/bookmark/math/geometry/geometric_algebra.md
+++ b/documentation/bookmark/math/geometry/geometric_algebra.md
@@ -1,5 +1,8 @@
 # Reference
 
+0. [Projective Geometric Algebra Done Right](http://terathon.com/blog/projective-geometric-algebra-done-right/)
+	0. [Symmetries in Projective Geometric Algebra](http://terathon.com/blog/symmetries-in-projective-geometric-algebra/)
+0. [Projective Geometric Algebra](http://projectivegeometricalgebra.org/)
 0. [A Swift Introduction to Geometric Algebra](https://www.youtube.com/watch?v=60z_hpEAtD8)
-0. [Addendum to A Swift Introduction to Geometric Algebra](https://www.youtube.com/watch?v=0bOiy0HVMqA)
+	0. [Addendum to A Swift Introduction to Geometric Algebra](https://www.youtube.com/watch?v=0bOiy0HVMqA)
 
-- 
cgit v1.2.3