Dynamical System Stability Analysis of the Interaction Nitrogen, Phytoplankton, Macrobenthos, and Sediment with Gradient Variable Method - Laksanahati, Tri; ., Widowati; Putro, Sapto Purnomo; Adhy, Satriyo; Helmi, Mohammad; Rostika, Rita (International Journal Of Mathematics And Computer Research, 2022)