Giannakopoulos, T. Stamatogiannakis, E. Foufoulas, I. Dimitropoulos, H. Manola, N. Ioannidis, Y., Content Visualization of Scientific Corpora Using an Extensible Relational Database Implementation, Communications in Computer and Information Science, (416 CCIS), 101-112, 2014, Springer-Verlag,