diff --git a/articles/links-of-the-open-world-programmer/page.mmd b/articles/links-of-the-open-world-programmer/page.mmd
index 36daf7c..f8de9e4 100644
--- a/articles/links-of-the-open-world-programmer/page.mmd
+++ b/articles/links-of-the-open-world-programmer/page.mmd
@@ -65,6 +65,9 @@ CSS:    /style.css
 - [Capsule collision detection](https://wickedengine.net/2020/04/26/capsule-collision-detection/)
 - [Forsyth vertex cache optimization](https://tomforsyth1000.github.io/papers/fast_vert_cache_opt.html)
 - [Depth buffer based lighting](https://www.researchgate.net/publication/320616607_Eye-Dome_Lighting_a_non-photorealistic_shading_technique)
+- [Computational Geometry in C (Second Edition)](http://www.science.smith.edu/~jorourke/books/compgeom.html)
+- [OpenGL FAQ](https://www.opengl.org/archives/resources/faq/technical/)
+- [SGI BSP FAQ](https://web.archive.org/web/20010614072959/http://reality.sgi.com/bspfaq/)
 
 ## generational stuff
 - [Domain warping](https://iquilezles.org/articles/warp/)
@@ -79,7 +82,6 @@ CSS:    /style.css
 ## notable extensions
 - [Vertex array locking](https://registry.khronos.org/OpenGL/extensions/EXT/EXT_compiled_vertex_array.txt)
 - [Packed pixels](https://people.freedesktop.org/~marcheu/extensions/EXT/packed_pixels.html)
-- [Provoking vertex](https://registry.khronos.org/OpenGL/extensions/EXT/EXT_provoking_vertex.txt)
 - [Framebuffer fetch](https://registry.khronos.org/OpenGL/extensions/EXT/EXT_shader_framebuffer_fetch.txt)
 - [Integer textures](https://registry.khronos.org/OpenGL/extensions/EXT/EXT_texture_integer.txt)
 - [Texture swizzle](https://registry.khronos.org/OpenGL/extensions/EXT/EXT_texture_swizzle.txt)
@@ -96,7 +98,7 @@ CSS:    /style.css
 - [Shader inter group communication](https://registry.khronos.org/OpenGL/extensions/ARB/ARB_shader_ballot.txt)
 - [Granular buffer memory control](https://registry.khronos.org/OpenGL/extensions/ARB/ARB_sparse_buffer.txt)
 - [Window pos](https://people.freedesktop.org/~marcheu/extensions/ARB/window_pos.html)
-- [Optimized fixed function fog](https://people.freedesktop.org/~marcheu/extensions/doc/fog_coord.html)
+- [No perspective interpolation for screen aligned geometry](https://registry.khronos.org/OpenGL/extensions/NV/NV_shader_noperspective_interpolation.txt)
 
 ## data representations
 - [Efficient varying-length integers](https://john-millikin.com/vu128-efficient-variable-length-integers)