Allen M. balance sheet approach to financial crisis / M.Allen,C.Rosenberg,C.Keller, 2002. - 63 p. - Текст : непосредственный.
Working paper / Intern. monetary fund. WP/07/233 : Measuring sovereign risk in Turkey: an application of the contingent claims approach / C. Keller, P. Kunzel, M. Souto, 2007. - 27 p. - Текст : непосредственный.
Heller P.S. Social sector reform in transition countries / P.S.Heller,C.Keller, 2001. - 26 p. - Текст : непосредственный.
Keller C. Radiochemistry / C.Keller, 1988. - 208 p. - Текст : непосредственный.