Dervis, Kemal. Policy analysis of shadow pricing, foreign borrowing and resource extractionin Egypt / Kemal Dervis et al. - Washington, DC : The World Bank, 1984. - 161 p. ; 27 cm. - World Bank staff working papers no. 622 . Open. ISBN: 0821302779 Subjects--Topical Terms: Egypt--Economic conditions-1952--Mathematical models.Shadow prices--Egypt--Mathematical models.