The final AREEF evaluation paper has been presented at MobileHCI 2016 in beautiful Florence. The full reference is as follows:

Oppermann, Leif, Lisa Blum, and Marius Shekow (2016)
“Playing on AREEF – Evaluation of an Underwater Augmented Reality Game for Kids”. Presented at MobileHCI, pp. 330-340 Florence, Italy

The paper can be accessed via the ACM Digital Library and Researchgate.