OJO, S.O. Productivity and Technical Efficiency of Poultry Egg Production in Nigeria. International Journal of Poultry Science, Pakistan, v. 2, n. 6, p. 459–464, 2003. DOI: 10.3923/ijps.2003.459.464. Disponível em: https://ijpsjournal.org/index.php/ijps/article/view/133. Acesso em: 22 sep. 2025.