1. Åström K.J. and B. Wittenmark (1988). Adaptive Control. Prentice Hall.
2. Ballance. D.J. (1988). Control Methodology Applied to National Fishing Strategies., D. Phil Thesis, U. of Oxford.
3. Ballance, D.J., O.L.R. Jacobs, and J.W. Horwood (1988a). Application of CADCS Methods to a problem in Fishery Management. 4th IFAC Symp. on CADCS, Beijing.
4. Ballance, D.J., O.L.R. Jacobs, and J.W. Horwood (1988b). State Estimation in Regulating a Harvested Population. 8th IFAC/IFORS Symp. Ident. and Par. Est., Beijing.
5. Beddington, J.R., and R.M. May (1977). Harvesting Natural Populations in a Randomly Fluctuating Environment. Science, 197,463–465.