005570000a22002170004500440002800000500002800028650001900056650001600075650001200091650001800103650001500121082001900136530000600155100001600161245007800177020001800255260003500273260000900308300001400317041000800331  aWBI development studies  aBibliography: p.123-130  aTransportation  aEnvironment  aQuality  aPrivatization  aTransports  a388bW893pcUN  aM  aCoelli, Tim  aA primer on efficiency measurement for utilities and transport regulators  a0-8213-5379-9  aWashington D.CbThe World Bank  c2003  axii,134p.  aEng