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Dyfyniad Arddull ChicagoBennett, G., P. Newman, and A. Polydor. Letter of Reply. Oxford Institute for Energy Studies, 2015.
Dyfyniad MLABennett, G., et al. Letter of Reply. Oxford Institute for Energy Studies, 2015.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.