Ikeda, Kota, and Takeshi Miki. “Regime Shift in a phytoplankton–phosphorus Model With Vertical Structure and Seasonality”. Tamkang Journal of Mathematics 47, no. 1 (March 30, 2016). Accessed May 4, 2024. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/109-125.