diff --git a/DESCRIPTION b/DESCRIPTION
index d08227f..786e11e 100755
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -20,7 +20,7 @@ Description: Calculates ratings for two-player or
   package refers to Mark E. Glickman (1999) 
   <http://www.glicko.net/research/glicko.pdf>; 
   Mark E. Glickman (2001) <doi:10.1080/02664760120059219>; 
-  Ruby C. Weng, Chih-Jen Lin (2011) <doi:10.2307/270983>; 
+  Ruby C. Weng, Chih-Jen Lin (2011) <https://www.jmlr.org/papers/volume12/weng11a/weng11a.pdf>; 
   W. Penny, Stephen J. Roberts (1999) <doi:10.1109/IJCNN.1999.832603>.
 BugReports: https://github.com/gogonzo/sport/issues
 Imports: 
diff --git a/vignettes/the_theory.Rmd b/vignettes/the_theory.Rmd
index aa304e8..a28f6f4 100644
--- a/vignettes/the_theory.Rmd
+++ b/vignettes/the_theory.Rmd
@@ -191,7 +191,7 @@ print(model$final_r)
 ```
 
 For more details read
-[Ruby C. Weng and Chih-Jen Lin (2011)](https://doi.org/10.2307/270983)
+[Ruby C. Weng and Chih-Jen Lin (2011)](https://www.jmlr.org/papers/volume12/weng11a/weng11a.pdf)
 
 ## Dynamic Bayesian Logit
 Following algorithm gives some advantages over mentioned rating systems, allowing