- Floudas, C A, Pardalos, P M, Adjiman, C S, Esposito, W R, Gumus, Z H, Harding, S T, Klepeis, J L, Meyer, C A, and Schweiger, C A, Handbook of Test Problems in Local and Global Optimization. Kluwer Academic Publishers, 1999.
- Dixon, L, and Szegoe, G P, Towards Global Optimization. In University of Cagliari, Ed, Proceedings of a Workshop at the University of Cagliari, Italy. North Holland, 1975.
- Original source: Global Model of Chapter 8 ex8.1.4.gms from Floudas e.a. Test Problems