Representative com estimate for no-PDF (yellow) study; author preference unknowable. Value -0.19 confirmed against Dahl DEDD ref Aus81 (El IR -0.19); Dahl cross-check CONFIRMED.
ADNDE (1981): "Forecasts of Energy Demand and Supply: Primary and Secondary Fuels, Australia: 1980-81 to 1089-90." Australian Department of National Development and Energy, Australian Governemt Publishing Service, Canberra