Publicspending. gr: network analysis in public expenditure M. Vafopoulos, I. Anagnostopoulos, M. Meimaris, M. Klonaras, I. Xidias, A. Papantoniou, G. Vafeiadis, V. Loumos and G. Alexiou Multimedia Technology Laboratory, School of Electrical and Computer Engineering, National Technical University of Athens