Grass, C. R., and B. M. Orwell. “Determinants of Share Value Creation Among Listed Companies in the Frankfurt Stock Exchange, Germany: Literature and Theoretical Examination”. Journal of Finance and Accounting, vol. 5, no. 3, Sept. 2021, pp. 1-10, https://stratfordjournal.org/journals/index.php/journal-of-accounting/article/view/911.