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Elsevier‎(1999)‎

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By Magkos E.   Kotzanikolaou P.   Douligeris C.   in Electronic Government, an International Journal

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Inderscience Publishers‎(2007)‎

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By Iakovou E.   Ip C.M.   Douligeris C.   Korde A.   in European Journal of Operational Research

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Elsevier‎(1997)‎

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