diff --git a/paper.bib b/paper.bib
index 8c8e6094..9227a3a1 100644
--- a/paper.bib
+++ b/paper.bib
@@ -31,7 +31,7 @@ @article{wu2018density
   doi={10.1080/03610926.2017.1285929}
 }
 
-@article{sklar1959fonction,
+@article{sklar1959fonctions,
   title={Fonction de r{\'e}partition dont les marges sont donn{\'e}es},
   author={Sklar, Abe},
   journal={Inst. Stat. Univ. Paris},
@@ -100,6 +100,7 @@ @Article{cop3
     number = {9},
     pages = {1--20},
     url = {http://www.jstatsoft.org/v34/i09/},
+    doi = {10.18637/jss.v034.i09},
   }
   @Article{cop4,
     title = {Nested Archimedean Copulas Meet {R}: The {nacopula}
@@ -111,6 +112,7 @@ @Article{cop4
     number = {9},
     pages = {1--20},
     url = {http://www.jstatsoft.org/v39/i09/},
+    doi = {10.18637/jss.v039.i09},
   }
   @Misc{future,
     author = {Henrik Bengtsson},