Kirchem, D., M. Giberti, R. Kaan Dereli, J. Kiviluoma, M. Lynch and E. Casey (2023). A linear reduced-order model for the activated sludge process for the integration into a mixed-integer linear energy system optimisation model, ESRI Working Paper 764, Dublin: ESRI, https://www.esri.ie/publications/a-linear-reduced-order-model-for-the-activated-sludge-process-for-the-integration-into