Links[1] https://www.iesl.forth.gr/en/A-5295-2008 [2] https://www.iesl.forth.gr/sites/default/files/publications/165.pdf [3] https://www.iesl.forth.gr/en/research/PPM [4] https://www.iesl.forth.gr/en/project/visorsurf [5] https://www.iesl.forth.gr/en/project/exel