A Comparative Study of Sodium Sulfide and Sodium Hydroxide for Keratin Extraction from Waste Chicken Feathers Based on Response Surface Methodology (RSM). SJFSSU [انترنت]. 17 أبريل، 2026 [وثق 13 يونيو، 2026];6(1):16-23. موجود في: http://journal.su.edu.ly/index.php/jsfsu/article/view/3871