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Dyfyniad Arddull ChicagoSiebrand,Jan C. Towards Operational Disequilibrium Macroeconomics. Hague: Martinus Nijhoff, 1979.
Dyfyniad MLASiebrand,Jan C. Towards Operational Disequilibrium Macroeconomics. Martinus Nijhoff, 1979.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.