DB - Optimal Criterion Design to Estimate the Parameters of Some Proportional Hazards Model with Minimal Variance with Practical Application. Journal of Al-Rafidain University College For Sciences ( Print ISSN: 1681-6870 ,Online ISSN: 2790-2293 ), [S. l.], v. 50, n. 3, p. 87–94, 2022. DOI: 10.55562/jrucs.v50i3.503. Disponível em: https://jrucs.iq/index.php/JAUCS/article/view/503. Acesso em: 16 apr. 2026.