A. C. Fairlie-Clarke and M. H. Muller, “Determinants of Profit as the Criterion for the Evaluation of the Product Development Process”, Acta Polytech, vol. 40, no. 4, Jan. 2000, Accessed: Apr. 02, 2025. [Online]. Available: https://ojs.cvut.cz/ojs/index.php/ap/article/view/124