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Dyfyniad Arddull ChicagoLIND, Robert C et al. Discounting for Time and Risk in Energy Policy. Washington: Resource for the Future, 1982.
Dyfyniad MLALIND, Robert C et al. Discounting for Time and Risk in Energy Policy. Resource for the Future, 1982.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.