Barbarossa was developed by Vlasios Kasapakis in the Department of Cultural Technology and Communication in the University of the Aegean during a PhD research with the following title "Blending of Pervasive and Trans-Reality Games: Design, Development and Evaluation of a Research Prototype".
Barbarossa was published in ICCIT 2013
"Communications and information technology (iccit), 2013 third international conference."
under the title "Addressing openness and portability in outdoor pervasive role-playing games".
You can find the digital copy of this paper here : Published material