1. Grjotheim K, Welch BJ (1988). Aluminium smelter technology–a pure and applied approach. Aluminium-Verlag, Konigsallee.
2. Yao Y, Cheung CY, Bao J, Skyllas-Kazacos M, Welch BJ, Akhmetov S (2017) Estimation of spatial alumina concentration in an aluminium reduction cell using a multilevel state observer. AIChE 68(7): 2806–2818.
3. Haupin W (1998) Interpreting the components of cell voltage. Light Metals 1998, TMS, p 531–537.
4. Jessen SW (2008) Mathematical modelling of a Hall-Héroult aluminium reduction cell. Master thesis, Technical University of Denmark.
5. Jens B (1992) A method for the control of alumina concentration in aluminium reduction cells. Modeling, Identification and Control 13(1): 41–49.