فيصل مفتاح شلوف و أحمد محمد أحمد عريدة 2017. An Economic Study of Estimating Cost Function of Dates Production in Wadi al-Shati and Sebha municipalities, South Libya. Journal of Pure & Applied Sciences . 16, 1 (Sep. 2017). DOI:https://doi.org/10.51984/jopas.v16i1.974.