Rahma Wati, Yunita, Heti Herawati, Nora Akbarsyah, and Zahidah. “Primary Productivity Based on Chlorophyll-a Concentration in the Luk Ulo River Estuary, Kebumen Regency, Central Java ”. Grouper 16, no. 2 (September 30, 2025): 357–367. Accessed March 10, 2026. https://grouper.unisla.ac.id/index.php/grouper/article/view/325.