* Hyndman, R.J., Koehler, A.B (2005) [http://www.robjhyndman.com/papers/mase.pdf " Another look at measures of forecast accuracy"], Monash University.
* Hoover, Jim (2009) [http://forecasters.org/pdfs/foresight/Foresight_ForecastAccReprint.pdf "How to Track Forecast Accuracy to Guide Process Improvement"], Foresight: The International Journal of Applied Forecasting.
