1. Poskitt, D.S. and Tremayne, A.R., The Selection and Use of Linear and Bilinear Time Series Models, Int. J. Forecasting, 1986, vol. 2, no. 1, pp. 101–114.
2. Tong, H., Non-linear Time Series: A Dynamical System Approach, Oxford, UK: Clarendon, 1990.
3. Tong, H., Threshold Models in Non-linear Time Series Analysis, Lect. Notes Statist., vol. 21, Berlin: Springer, 1983.
4. Tong, H. and Lim, K.S., Threshold Autoregression, Limit Cycles and Cyclical Data, J. Roy. Statist. Soc. Ser. B, 1980, vol. 42, no. 3. 245–292.
5. Engle, R.F., Autoregressive Conditional Heteroscedasticity with Estimates of the Variance of United Kingdom Inflation, Econometrica, 1982, vol. 50, pp. 987–1007.