Wulandari, D., Witjaksono, M., Soseco, T. and Narmaditya, B. S. (2017) “The Development of Productive Economy Cluster through Siparti 3-S and Triple Helix in Kabupaten Lumajang, Indonesia”, International Journal of Economics and Financial Issues, 7(2), pp. 25–31. Available at: https://www.econjournals.com/index.php/ijefi/article/view/3796 (Accessed: 25 May 2022).