00356nam a2200121Ia 4500020001500000082002200015100002000037245009100057260004800148300002800196500000500224700000500229  a0521802563  a658.4034bR264.DE  aRay, Subhash C.  aData envelopment analysisbtheory and techniques for economics and operations research  aCambridgebCambridge University Pressc2004  axii, 353p. Bibl. Index.  a  a