AYINDEA, Kayode. Combined Estimators as alternative to Ordinary Least Square Estimator. International Journal of Sciences: Basic and Applied Research (IJSBAR), Jordan, v. 8, n. 1, p. 74–82, 2013. Disponível em: https://www.gssrr.org/JournalOfBasicAndApplied/article/view/1159. Acesso em: 14 may. 2026.