add accidentally removed references back

README.md

@@ -65,6 +65,11 @@ During the project group, you will learn and apply the following skills:
 
 ## References
 
+- [LP05] Charles Loop and Jim Blinn. 2005. Resolution independent curve rendering using programmable graphics hardware. ACM Trans. Graph. 24, 3 (July 2005), 1000–1009. https://doi.org/10.1145/1073204.1073303
+- [NH08] Diego Nehab and Hugues Hoppe. 2008. Random-access rendering of general vector graphics. ACM Trans. Graph. 27, 5, Article 135 (December 2008), 10 pages. https://doi.org/10.1145/1409060.1409088
+- [GLFN14] Francisco Ganacim, Rodolfo S. Lima, Luiz Henrique de Figueiredo, and Diego Nehab. 2014. Massively-parallel vector graphics. ACM Trans. Graph. 33, 6, Article 229 (November 2014), 14 pages. https://doi.org/10.1145/2661229.2661274 https://w3.impa.br/~diego/projects/GanEtAl14/
+- [LHZ16] Rui Li, Qiming Hou, and Kun Zhou. 2016. Efficient GPU path rendering using scanline rasterization. ACM Trans. Graph. 35, 6, Article 228 (November 2016), 12 pages. https://doi.org/10.1145/2980179.2982434 http://kunzhou.net/zjugaps/pathrendering/
+
 - [1] Ghostscript Tiger, [AGPLv3](https://git.ghostscript.com/?p=ghostpdl.git;a=blob_plain;f=doc/COPYING;hb=HEAD)
 - [2] Raph Levien. 2019. 2D Graphics on Modern GPU (blog post).https://raphlinus.github.io/rust/graphics/gpu/2019/05/08/modern-2d.html
 - [3] Diego Nehab. 2D Computer Graphics (course). 2020.https://w3.impa.br/~diego/teaching/vg/