VANDERPAL, G. Nonlinear Effect of R&D Expenditures and Intangible Assets on Financial Performance: A Panel Threshold Analysis. Journal of Applied Business and Economics, [S. l.], v. 21, n. 9, 2019. Disponível em: https://articlearchives.co/index.php/JABE/article/view/908. Acesso em: 11 oct. 2025.