Working paper / Intern. monetary fund. WP/09/151 : How the financial crisis affects pensions and insurance and why the impacts matter / G. Impavido, I. Tower, 2009. - 56 p. - Текст : непосредственный.
Working paper / Intern. monetary fund. WP/08/268 : Efficiency and performance of Bulgarian private pensions / G. Impavido, 2008. - 68 p. - Текст : непосредственный.