extend the bibliography

docs/andreas.bib

@@ -98,11 +98,20 @@
 }
 
 @misc{tree,
-	month = {{09}},
-	note = {{\url{https://stackoverflow.com/a/39729832}}},
+	month = {{11}},
+	note = {{\url{https://stackoverflow.com/a/8177290/7723859}}},
 	Urldate = {{2018-01-15}},
-	author = {ht\_},
-	title = {{Tree view in django template}},
-	year = {2016},
+	author = {Acorn},
+	title = {{Django hierarchical model list}},
+	year = {2011},
+}
+
+@misc{snb,
+	month = {{01}},
+	note = {{\url{https://www.snb.ch/selector/de/mmr/exfeed/rss}}},
+	Urldate = {{2018-02-01}},
+	author = {Schweizerische National Bank},
+	title = {{SNB Devisenkurse}},
+	year = {2018},
 }