Greek Prime Minister Lucas Papademos entered fresh talks late Monday with negotiators for private investors, seeking a bigger write-down than so far agreed, eurozone governmental sources said. \"Papademos has now gone in,\" one negotiator told AFP, after an initial meeting with Finance Minister Evangelos Venizelos. \"How much depends on the impact of other elements\" in the effort to close a 5.5-billion-euro gap on EU and IMF targets for Greek debt sustainability by 2020.