Abramovitz, M. (1986). Catching up, forging ahead, and falling behind. The Journal of Economic History, 46(02), 385–406.

Achsani, N. A., & H. Siregar. (2010). Classification of the ASEAN+ 3 Economies Using Fuzzy Clustering Approach. European Journal of Scientific Research, 39 (4), 489–497.

Ang, J. B., & J. B. Madsen. (2013). International R&D spillovers and productivity trends in the Asian miracle economies. Economic Inquiry, 51(2), 1523–1541.

Bajona, C., & T. J. Kehoe. (2010). Trade, growth, and convergence in a dynamic Heckscher–Ohlin model. Review of Economic Dynamics, 13 (3), 487–513.

Bank Indonesia. (2014). Laporan Perekonomian Indonesia 2013. Bank Indonesia.

Bernard, A. B., & S. N. Durlauf. (1996). Interpreting tests of the convergence hypothesis. Journal of Econometrics, 71(1), 161–173.

Boreiko, D. (2002). EMU and Accession Countries: Fuzzy Cluster Analysis of Membership (Working Papers Central Bank of Chile No. 189). Central Bank of Chile. Retrieved from http://ideas.repec.org/p/chb/bcchwp/189.html

Charles, A., O. Darne, & J.F. Hoarau. (2012). Convergence of real per capita GDP within COMESA countries: A panel unit root evidence. The Annals of Regional Science, 49(1), 53–71. doi:10.1007/s00168-010-0427-z

Grossman, G. M., & E. Helpman. (1991). Trade, knowledge spillovers, and growth. European Economic Review, 35(2), 517–526.

Helpman, E. (1981). International trade in the presence of product differentiation, economies of scale and monopolistic competition: A Chamberlin-Heckscher-Ohlin approach. Journal of International Economics, 11(3), 305–340.

Izakian, H., & A. Abraham. (2011). Fuzzy C-means and fuzzy swarm for fuzzy clustering problem. Expert Systems with Applications, 38(3), 1835–1838.

Jayanthakumaran, K., & S. W. Lee. (2013). Evidence on the Convergence of Per Capita Income: A Comparison of Founder Members of the Association of South East Asian Nations and the South Asian Association of Regional Cooperation. Pacific Economic Review, 18(1), 108–121. doi:10.1111/1468-0106.12013

Krugman, P. R. (1979). Increasing returns, monopolistic competition, and international trade. Journal of International Economics, 9(4), 469–479.

Leamer, E. E., & J. Levinsohn. (1995). International trade theory: the evidence. Handbook of International Economics, 3, 1339–1394.

Li, H. (2013). “Convergence” or “Divergence”?—Rethinking Regional Integration of the Past Two Decades. Frontiers of Economics in China, 8(4), 592–607. doi:10.3868/s060-002-013-0030-7

Muslim, A., & M. Ekananda. (2007). Implementasi Algoritma Cluster Fuzzy dan Neuro-Fuzzy Studi kasus Ekspor Indonesia ke Jepang. Seminar Ekonomi Nasional FEUI Jakarta.

Nahar, S., & B. Inder. (2002). Testing convergence in economic growth for OECD countries. Applied Economics, 34(16), 2011–2022.

Romer, D. (2011). Advanced Macroeconomics (4 edition). New York: McGraw-Hill/Irwin.

Sabaruddin, S. S. (2014). The Impact of Indonesia–China Trade Liberalisation on the Welfare of Indonesian Society and on Export Competitiveness. Bulletin of Indonesian Economic Studies, 50(2), 292–293.

Schmitt, C., & P. Starke. (2011). Explaining convergence of OECD welfare states: a conditional approach. Journal of European Social Policy, 21(2), 120–135.

Sjöholm, F. (1999). Productivity growth in Indonesia: the role of regional characteristics and direct foreign investment. Economic Development and Cultural Change, 47(3), 559–584.

Slaughter, M. J. (1998). International trade and per capita income convergence: a difference-in-differences analysis. National Bureau of Economic Research. Retrieved from http://www.nber.org/papers/w6557

Stroomer, C., & D. E. Giles. (2003). Income convergence and trade openness: fuzzy clustering and time series evidence. Department of Economics, University of Victoria, Econometrics Working Paper EWP0304, ISSN, 1485–6441.

Tapia-Herrera, R., J.A. Meda-Campaña, S. Alcántara-Montes, T.

Hernández-Cortés, & L. Salgado-Conrado. (2013). Tuning of a TS Fuzzy Output Regulator Using the Steepest Descent Approach and ANFIS. Mathematical Problems in Engineering, 2013. Retrieved from http://www.hindawi.com/journals/mpe/aip/873430/

Wong, B. K., & V.S. Lai. (2011). A survey of the application of fuzzy set theory in production and operations management: 1998–2009. International Journal of Production Economics, 129(1), 157–168.

Zimmermann, H.J. (2010). Fuzzy set theory. Wiley Interdisciplinary Reviews: Computational Statistics, 2(3), 317–332.