1. ASHRAE Standard 41.4,1984
2. Properties of oil–refrigerant liquid mixtures with applications to oil concentration measurement;Baustian;ASHRAE Trans,1986
3. Measuring the concentration of a flowing oil–refrigerant mixture with a bypass viscometer;Baustian;ASHRAE Trans,1988
4. Measuring the concentration of a flowing oil–refrigerant mixture with an acoustic velocity sensor;Baustian;ASHRAE Trans,1988
5. An ultrasonic device for measuring the oil concentration in flowing liquid refrigerant;Meyer;Int J Refrigeration,1994