Do mergers enhance the performance of hospital efficiency? - J. M. Harris II; Hacer Özgen; Yasar A. Ozcan (J. Oper. Res. Soc., 2000)

Predictors of Informal Health Payments: The Example from Turkey. - Hacer Özgen; Bayram Sahin; Paolo Belli; Mehtap Tatar; Peter Berman (J. Medical Syst., 2010)

Assessment of hospital efficiency under health transformation program in Turkey. - Ismet Sahin; Yasar A. Ozcan; Hacer Özgen (Central Eur. J. Oper. Res., 2011)