Hyperbolic efficiency and return to the dollar. - Rolf Färe; Shawna Grosskopf; Osman Zaim (Eur. J. Oper. Res., 2002)

Measuring energy intensity in Japan: A new method. - Osman Zaim; Tugçe Uygurtürk Gazel; K. Ali Akkemik (Eur. J. Oper. Res., 2017)