Liu, Rong, and Guirong Liu. “Optimal Harvesting in a Unidirectional consumer–resource Mutualisms System With Size Structure in the Consumer”. Nonlinear Analysis: Modelling and Control 27, no. 2 (March 1, 2022): 385–411. Accessed May 20, 2024. https://www.journals.vu.lt/nonlinear-analysis/article/view/26314.