00274nam a2200109Ia 4500082002800000100002200028245005200050260002900102300002300131500000500154700000500159  a382.015157821bSg522.TD  aSgro, Pasquale M.  aThe theory of duality and international tradeb  aLondonbCroom-Helmc1986  a370p. Index, Bibl.  a  a