Lim Siew H and CAK Lovell (2004). “Short-Run Profit and Productivity of U.S. Class I Railroads.” in Emrouznejad A and V Podinovski (eds.) Proceedings of DEA2004, Birmingham, UK: 342.
Lim Siew H and CAK Lovell (2004). “Short-Run Profit and Productivity of U.S. Class I Railroads.” in Emrouznejad A and V Podinovski (eds.) Proceedings of DEA2004, Birmingham, UK: 342.