1. “Infrastructure Cost Recovery Update,” Natural Gas Rate Round-Up;American Gas Association,2012
2. Behavior of the firm under regulatory constraint;Averch;Am. Econ. Rev.,1962
3. Survey of Benchmarking Methodologies;Berg,2006
4. Rules and Regulations Governing the Distribution and Sale of gas;Chesapeake Utilities Corporation, Delaware Division,2008
5. Into Thin Air: How Leaking Natural Gas Infrastructure is Harming our Environment and Wasting a Valuable Resource;Cleveland,2012