Research and Advanced Technology for Digital Libraries International Conference on Theory and Practice of Digital Libraries, TPDL 2013, Valletta, Malta, September 22-26, 2013. Proceedings - Aalberg, Trond; Papatheodorou, Christos; Dobreva, Milena; Tsakonas, Giannis; Farrugia, Charles J. (Springer Berlin Heidelberg : Imprint: Springer, 2013)