C.  Bouras, Kokkinos, V., Tseliou, G., Filopoulos, A., Michalopoulos, S., ??? Papadopoulos, D., ?????., ?Guidelines for the procurement of free and open source software in public administrators?, in IADIS International Conference Information Systems Post-Implementation and Change Management 2012, Lisbon, Portugal, 2012, ?? 29-36.