1. Standard Method for Measurement of Proportion of Oil in Liquid Refrigerant;ASHRAE Standard 41.4–1996,1996
2. Online measurement of oil concentrations of R-134a/oil mixtures a density flowmeter;Bayani;HVAC&R Research,1995
3. Properties of oil-refrigerant liquid mixtures with applications to oil concentration measurement: part I-thermophysical and transport properties;Baustian;ASHRAE Transactions,1986
4. Properties of oil-refrigerant liquid mixtures with applications to oil concentration measurement: part II-electrical and optical properties;Baustian;ASHRAE Transactions,1986
5. Measuring the concentration of a flowing oil-refrigerant mixture with a bypass viscometer;Baustian;ASHRAE Transactions,1988