diff --git a/adv_lab.bib b/adv_lab.bib
index 04f732f..e6dbc82 100644
--- a/adv_lab.bib
+++ b/adv_lab.bib
@@ -100,4 +100,13 @@ url = {http://www.test.org/doe/}
 @ONLINE{EngToolbox:AirDensity,
 title = {Air - Density and Specific Weight},
 url = {http://www.engineeringtoolbox.com/air-density-specific-weight-d_600.html}
-}
\ No newline at end of file
+}
+
+@misc{larsen2004thorium,
+  title={Thorium-227 for use in radiotherapy of soft tissue disease},
+  author={Larsen, R. and Bruland, {\O}.},
+  url={http://www.google.com/patents/WO2004091668A1?cl=en},
+  year={2004},
+  month=oct # "~28",
+  publisher={Google Patents},
+  note={WO Patent App. PCT/GB2004/001,654}