A primer on efficiency measurement for utilities and transport regulators / Tom Coelli ........ et al. - Washington, D. C : World Bank, 2003. - xii, 134p : ill. ; 24 cm. - WBI development studies . Includes bibliographical references and index. Open access ISBN: 0821353799 Subjects--Topical Terms: Infrastructure (Economics)--Government policy.Infrastructure (Economics)--Evaluation.