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2. Standard Method for Measurement of Proportion of Oil in Liquid Refrigerant;ASHRAE standard 41.4-1984,1984
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4. Properties of oil–refrigerant liquid mixtures with applications to oil concentration measurement: Part II – electrical and optical properties;Baustian;ASHRAE Trans.,1986
5. Measuring the concentration of a flowing oil–refrigerant mixture with an acoustic velocity sensor;Baustian;ASHRAE Trans.,1988