QIAN, Congyang. Comparative Analysis of the Markowitz Model and the Kraljic Matrix Model in Portfolio Optimization and Procurement Management. Science and Technology of Engineering, Chemistry and Environmental Protection, [S. l.], v. 2, n. 5, p. 3122, 2024. DOI: 10.61173/vye4ay39. Disponível em: https://stecep.deanfrancis.press/article/view/1519. Acesso em: 4 nov. 2026.