feat(dissertation): add section about Safety in Background

pub/dissertation/references.bib

@@ -75,6 +75,17 @@
   url = {https://www.caa.co.uk/cap745},
 }
 
+@techreport{faa-reasons,
+  author = {Knecht, William R. and Lenz, Michael},
+  title = {Causes of General Aviation Weather-Related, Non-Fatal Incidents:
+           Analysis Using NASA Aviation Safety Reporting System Data},
+  institution = {FAA Office of Aerospace Medicine Civil Aerospace Medical
+                 Institute},
+  number = {DOT/FAA/AM-10/13},
+  year = {2010},
+  month = {09},
+}
+
 @online{vdm,
   author = {The Overture Project},
   title = {The Vienna Development Method},