Green supplier selection based on IFS and GRA. - Özkan Bali; Erkan Kose; Serkan Gumus (Grey Syst. Theory Appl., 2013)

Developing an early warning system to predict currency crises. - Cuneyt Sevim; Asil Oztekin; Özkan Bali; Serkan Gumus; Erkam Güresen (Eur. J. Oper. Res., 2014)

Multi-terms MADM procedures with GRA and TOPSIS based on IFS and IVIFS. - Özkan Bali; Serkan Gumus (Grey Syst. Theory Appl., 2014)

An integrated dynamic intuitionistic fuzzy MADM approach for personnel promotion problem. - Özkan Bali; Metin Dagdeviren; Serkan Gumus (Kybernetes, 2015)

A Multi-Period Decision Making Procedure Based on Intuitionistic Fuzzy Sets for Selection Among Third-Party Logistics Providers. - Özkan Bali; Serkan Gumus; Ihsan Kaya (J. Multiple Valued Log. Soft Comput., 2015)

Integrating expert weighting and multi-criteria decision making into eco-efficiency analysis: the case of US manufacturing. - Serkan Gumus; Gokhan Egilmez; Murat Kucukvar; Yong Shin Park (J. Oper. Res. Soc., 2016)