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@@ -10,4 +10,8 @@ Navigation
 ### [Software Architecture](Software Architecture) 
 - ##### [Packages](Packages)
 ### [Implementation](Implementation)
-### [User Study](User Study)
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+### [User Study](User Study)
+
+
+##### References
+* Engel, Christin & Weber, Gerhard. (2019). User Study: A Detailed View on the Effectiveness and Design of Tactile Charts. 10.1007/978-3-030-29381-9_5.   
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