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2. T. Berntsson, CFC Forum, IIR Conference, Purdue University, West Lafayette, Ind. (1988).
3. ASHRAE, ASHRAE Standard 15-1978, Safety Code for Mechanical Refrigeration (ASHRAE, Atlanta, 1978).
4. ISO, ISO/R1662-1971, Refrigerating Plants-Safety Rules (International Organization for Standardization, 1971).
5. M. O. McLinden and D. A. Didion, ASHRAE J. 29(12):32 (1987).