Update file README.md

README.md

@@ -8,3 +8,10 @@ The project contains:
 * machine learning (Orange's workflows)
 * band heart rate app (application for Android to acquire heart rate from Microsoft Band 2)
 * and folder *study data*, which consists of the raw data from wireless module and from the cognitive load measuring app (not included in this project) 
+
+
+## Citing
+
+If using this code, please cite:
+
+Pejović, V., Matkovič, T., & Ciglarič, M. (2021). Wireless ranging for contactless cognitive load inference in ubiquitous computing. International Journal of Human–Computer Interaction, 37(19), 1849-1873.
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