Minussi, J., Soopramanien, D. G. R. & Worthington, D. J., 2006, Lancaster University: The Department of Management Science, (Management Science Working Paper Series).
Fletcher, A., Halsall, D., Huxham, S. & Worthington, D. J., 2006, Lancaster University: The Department of Management Science, (Management Science Working Paper Series).
Worthington, D. J., Kowalczyk, R. H., Dalziel, M. & Robinson, P., 1999, Lancaster University: The Department of Management Science, (Management Science Working Paper Series).