00495nam a2200145 a 4500008004100000050001300041100001900054245013700073260004000210300001500250350000900265490003400274650001400308700002700322081002s2007    ||||||||||||||||| ||    u  aIBRD(08)  aNauges, Celine10aHow "natural" are natural monopolies in the water supply and sewerage sector?: case studies from developing and transition economies  aWashington, D. C.bWorld Bankc2007  a38p. :ill.  a0.00  aPolicy Research Working Paper 0aECONOMICS  aVan Den Berg, Caroline