Adam, Antonis; Delis, Manthos D and Kammas, Pantelis (2009): Are democratic governments more efficient? Unpublished.
Adam, Antonis; Delis, Manthos D and Kammas, Pantelis (2008): Public sector efficiency: Leveling the playing field between OECD countries. Unpublished.
Adam, Antonis and Kammas, Pantelis (2011): Redistribution through tax evasion. Unpublished.
Adam, Antonis; Kammas, Pantelis and Lagou, Athina (2011): The effect of globalization on capital taxation: What have we learned after 20 years of empirical studies? Unpublished.