1. ASHRAE, 1996. ANSI/ASHRAE Standard 41.4: Standard Method for Measurement of Proportion of Lubricant in Liquid Refrigerant, Atlanta, GA.
2. Measuring the concentration of a flowing oil–refrigerant mixture with a bypass viscometer;Baustian;ASHRAE Trans.,1988
3. Measuring the concentration of a flowing oil–refrigerant mixture with an acoustic velocity sensor;Baustian;ASHRAE Trans.,1988
4. Measuring the concentration of a flowing oil–refrigerant mixture with a vibrating U-tube densimeter;Baustian;ASHRAE Trans.,1988
5. Properties of oil– refrigerant liquid mixtures with applications to oil concentration measurement: part II – electrical and optical properties;Baustian;ASHRAE Trans.,1986