Chung, Anjung, and Sambock Park. “Effects Of Firm Uncertainty On Association R&D Expenditure And Firm Performance: Evidence From Korea”. Journal of Applied Business Research (JABR) 32, no. 6 (November 2, 2016): 1809-1824. Accessed September 28, 2021. https://clutejournals.com/index.php/JABR/article/view/9825.