Kocabıyık, Turan, Meltem Karaatlı, and Kemal Berkay Aktaş. 2021. “Clustering of Stocks Included in Borsa Istanbul 30 Index: A Pre-COVID-19 and COVID-19 Period Analysis”. Journal of Business Research - Turk 13 (3):2537-51. https://doi.org/10.20491/isarder.2021.1276.