احمد ي. ع. . An Econometrics Study of Estimate and Analyze a Cost Function for Beekeeping Fields in Halabja Governorate. The Scientific Journal of Cihan University– Sulaimaniya, [S. l.], v. 6, n. 1, p. 299-310, 2022. DOI: 10.25098/6.1.16. Disponível em: https://journal.sulicihan.edu.krd/index.php/sjcus/article/view/107. Acesso em: 12 feb. 2026.