Matthijs Kwak Gerrit Niezen Bram J. J. van der Vlist Jun Hu Loe M. G. Feijs Tangible Interfaces to Digital Connections, Centralized versus Decentralized. 132-146 2011 5 T. Edutainment http://dx.doi.org/10.1007/978-3-642-18452-9_11 journals/tedu/2011-5 db/journals/tedu/tedu5.html#KwakNVHF11