Sickles RC and ML Streitwieser (1992). “Technical Inefficiency and Productive Decline in the U. S. Interstate Natural Gas Pipeline Industry under the Natural Gas Policy Act.” in Gulledge TR and CAK Lovell (eds.) International Applications of Productivity and Efficiency Analysis, Kluwer Academic Publishers.
Sickles RC and ML Streitwieser (1992). “Technical Inefficiency and Productive Decline in the U. S. Interstate Natural Gas Pipeline Industry under the Natural Gas Policy Act.” in Gulledge TR and CAK Lovell (eds.) International Applications of Productivity and Efficiency Analysis, Kluwer Academic Publishers.