diff --git a/references.bib b/references.bib
index 739ce1c..19ef3c9 100644
--- a/references.bib
+++ b/references.bib
@@ -1,22 +1,21 @@
-@article{collisions,
-  author  = "Jiménez, Juan José and Segura, Rafael J. and Feito, Francisco R.",
-  title   = "Efficient collision detection between 2D polygons",
-  journal = "Journal of WSCG",
-  year    = 2004,
-  volume  = "12",
-  number  = "1-3",
-  pages   = "191--198"
-}
 @article{convexcollisionsSAT,
   title={Intersection of convex objects: The method of separating axes},
   author={Eberly, David},
   journal={WWW page},
+  pages={2-3},
   year={2001}
 }
-@article{collision:resolution,
+@article{collision:resolution-paper,
     title = "Physics Part 3: Collision Response",
     author = "Chris Hecker",
     journal = "Game Developer Magazine",
     year = 1997,
     url = {http://www.chrishecker.com/images/e/e7/Gdmphys3.pdf},
 }
+@article{collision:resolution-site,
+    title = "Rigid Body Collisions",
+    author = "Erik Neumann",
+    journal = "WWW page: myPhysicsLab.com",
+    year = 2003,
+    url = {https://www.myphysicslab.com/engine2D/collision-en.html},
+}