1. Abbasoglu, F. O., Aysan, A. F., & Gunes, A. (2007). Concentration, competition, efficiency and profitability of the Turkish Banking sector in the post crises period (MPRA Paper No. 5494). - http://mpra.ub.uni-muenchen.de/5494/
2. Al-Obaidan, A. M. (2008). Market structure, concentration and performance in the commercial banking industry of emerging market. European Journal of Economics, Finance, and Administrative Science, 1(12), 104-114. - https://www.researchgate.net/publication/255572872_Market_Structure_Concentration_and_Performance_in_the_Commercial_Banking_Industry_of_Emerging_Markets
3. The nexus between competition and efficiency: The European banking industries experience
4. Bank competition and efficiency: empirical evidence from Indian market
5. Atmawardhana. (2006). Analisis efisiensi Bank Umum Syariah dan Bank konvensional yang memiliki unit usaha Syariah di Indonesia, setelah pemberlakuan Undang-Undang No. 10 Tahun 1998 tentang Perbankan (Pendekatan Data Envelopment Analysis) [Efficiency Analysis of Sharia Commercial Banks and Conventional Banks which is having Sharia Business Units in Indonesia, after the enactment of Law No. 10 of 1998 concerning Banking (Data Envelopment Analysis Approach)] (Unpublished Thesis). Faculty of Economic, Indonesia Islamic University, Yogyakarta, Indonesia.