diff --git a/bib/sivanov.bib b/bib/sivanov.bib
index d7d6b40..2d4bda3 100644
--- a/bib/sivanov.bib
+++ b/bib/sivanov.bib
@@ -14,6 +14,23 @@
   bibsource = {dblp computer science bibliography, http://dblp.org}
 }
 
+@article{DBLP:journals/tcs/AzimiGIP15,
+  author    = {Sepinoud Azimi and
+               Cristian Gratie and
+               Sergiu Ivanov and
+               Ion Petre},
+  title     = {Dependency graphs and mass conservation in reaction systems},
+  journal   = {Theor. Comput. Sci.},
+  volume    = {598},
+  pages     = {23--39},
+  year      = {2015},
+  url       = {http://dx.doi.org/10.1016/j.tcs.2015.02.014},
+  doi       = {10.1016/j.tcs.2015.02.014},
+  timestamp = {Fri, 18 Sep 2015 01:00:00 +0200},
+  biburl    = {http://dblp.uni-trier.de/rec/bib/journals/tcs/AzimiGIP15},
+  bibsource = {dblp computer science bibliography, http://dblp.org}
+}
+
 @inproceedings{DBLP:conf/mcu/0001V15,
   author    = {Sergiu Ivanov and
                Sergey Verlan},