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diff --git a/bibliography.bib b/bibliography.bib
index 400c416..4e6d336 100644
--- a/bibliography.bib
+++ b/bibliography.bib
@@ -1,3 +1,13 @@
+@book{open-heaven,
+    author={Rowland, Christopher},
+    address={London},
+    isbn={0281037841},
+    publisher={SPCK},
+    title={The open heaven},
+    subtitle={a study of apocalyptic in Judaism and early Christianity},
+    date={1982},
+}
+
 @incollection{vielhauer-apocalypses,
     author={Vielhauer, Philipp},
     date={1965},