diff --git a/bib/sivanov.bib b/bib/sivanov.bib
index 0061b1d..dbc8f24 100644
--- a/bib/sivanov.bib
+++ b/bib/sivanov.bib
@@ -1,3 +1,39 @@
+@article{DBLP:journals/jmemcom/AlhazovF021,
+  author    = {Artiom Alhazov and
+               Rudolf Freund and
+               Sergiu Ivanov},
+  title     = {P systems with limited number of objects},
+  journal   = {J. Membr. Comput.},
+  volume    = {3},
+  number    = {1},
+  pages     = {1--9},
+  year      = {2021},
+  url       = {https://doi.org/10.1007/s41965-020-00068-6},
+  doi       = {10.1007/s41965-020-00068-6},
+  timestamp = {Wed, 07 Apr 2021 01:00:00 +0200},
+  biburl    = {https://dblp.org/rec/journals/jmemcom/AlhazovF021.bib},
+  bibsource = {dblp computer science bibliography, https://dblp.org}
+}
+
+@article{DBLP:journals/corr/abs-2104-09206,
+  author    = {Elio Nushi and
+               Victor{-}Bogdan Popescu and
+               Jos{\'{e}} {\'{A}}ngel S{\'{a}}nchez Mart{\'{\i}}n and
+               Sergiu Ivanov and
+               Eugen Czeizler and
+               Ion Petre},
+  title     = {Network modeling methods for precision medicine},
+  journal   = {CoRR},
+  volume    = {abs/2104.09206},
+  year      = {2021},
+  url       = {https://arxiv.org/abs/2104.09206},
+  archivePrefix = {arXiv},
+  eprint    = {2104.09206},
+  timestamp = {Tue, 27 Apr 2021 01:00:00 +0200},
+  biburl    = {https://dblp.org/rec/journals/corr/abs-2104-09206.bib},
+  bibsource = {dblp computer science bibliography, https://dblp.org}
+}
+
 @article{DBLP:journals/biosystems/DelaplaceI20,
   author    = {Franck Delaplace and
                Sergiu Ivanov},
@@ -8,7 +44,7 @@
   year      = {2020},
   url       = {https://doi.org/10.1016/j.biosystems.2020.104205},
   doi       = {10.1016/j.biosystems.2020.104205},
-  timestamp = {Fri, 25 Dec 2020 00:00:00 +0100},
+  timestamp = {Thu, 29 Apr 2021 01:00:00 +0200},
   biburl    = {https://dblp.org/rec/journals/biosystems/DelaplaceI20.bib},
   bibsource = {dblp computer science bibliography, https://dblp.org}
 }
@@ -82,6 +118,35 @@
   bibsource = {dblp computer science bibliography, https://dblp.org}
 }
 
+@inproceedings{DBLP:conf/complexnetworks/Segretain0TG20,
+  author    = {R{\'{e}}mi Segretain and
+               Sergiu Ivanov and
+               Laurent Trilling and
+               Nicolas Glade},
+  editor    = {Rosa M. Benito and
+               Chantal Cherifi and
+               Hocine Cherifi and
+               Esteban Moro and
+               Luis Mateus Rocha and
+               Marta Sales{-}Pardo},
+  title     = {A Methodology for Evaluating the Extensibility of Boolean Networks'
+               Structure and Function},
+  booktitle = {Complex Networks {\&} Their Applications {IX} - Volume 2, Proceedings
+               of the Ninth International Conference on Complex Networks and Their
+               Applications, {COMPLEX} {NETWORKS} 2020, 1-3 December 2020, Madrid,
+               Spain},
+  series    = {Studies in Computational Intelligence},
+  volume    = {944},
+  pages     = {372--385},
+  publisher = {Springer},
+  year      = {2020},
+  url       = {https://doi.org/10.1007/978-3-030-65351-4\_30},
+  doi       = {10.1007/978-3-030-65351-4\_30},
+  timestamp = {Fri, 26 Mar 2021 10:51:59 +0100},
+  biburl    = {https://dblp.org/rec/conf/complexnetworks/Segretain0TG20.bib},
+  bibsource = {dblp computer science bibliography, https://dblp.org}
+}
+
 @article{DBLP:journals/corr/abs-2001-07371,
   author    = {Franck Delaplace and
                Sergiu Ivanov},
@@ -505,7 +570,7 @@
   year      = {2016},
   url       = {https://doi.org/10.1016/j.tcs.2015.11.040},
   doi       = {10.1016/j.tcs.2015.11.040},
-  timestamp = {Sat, 05 Sep 2020 01:00:00 +0200},
+  timestamp = {Wed, 17 Feb 2021 00:00:00 +0100},
   biburl    = {https://dblp.org/rec/journals/tcs/AzimiG0MPP16.bib},
   bibsource = {dblp computer science bibliography, https://dblp.org}
 }
@@ -652,7 +717,7 @@
   year      = {2015},
   url       = {https://doi.org/10.1016/j.tcs.2015.02.014},
   doi       = {10.1016/j.tcs.2015.02.014},
-  timestamp = {Mon, 15 Jun 2020 01:00:00 +0200},
+  timestamp = {Wed, 17 Feb 2021 00:00:00 +0100},
   biburl    = {https://dblp.org/rec/journals/tcs/AzimiGIP15.bib},
   bibsource = {dblp computer science bibliography, https://dblp.org}
 }