diff --git a/sem/sem.bib b/sem/sem.bib
index 3216c86..6622169 100755
--- a/sem/sem.bib
+++ b/sem/sem.bib
@@ -274,6 +274,16 @@ Die Haager Friedenskonferenzen können als gelungene Kodifikation in Bezug auf d
   Timestamp                = {2014.10.24}
 }
 
+@Www{ivpn.net,
+  Title                    = {{PPTP} vs {L2TP/IPSec} vs {OpenVPN}},
+  Author                   = {ivpn.net},
+  Date                     = {2014-11-29},
+  Url                      = {https://www.ivpn.net/pptp-vs-l2tp-vs-openvpn},
+
+  Owner                    = {jim},
+  Timestamp                = {2014.11.29}
+}
+
 @Inbook{Jurafsky2009,
   Title                    = {Speech and Language Processing},
   Author                   = {Jurafsky, Daniel and Martin, James H.},