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• Rothfleisch, P. I.; Didion, D. A.
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  Study of Heat Pump Performance Using Mixtures of R32/R134a and R32/R125/R134a as "Drop-In" Working Fluids for R22 With and Without a Liquid-Suction Heat Exchanger.
  National Institute of Standards and Technology, Gaithersburg, MD
  Department of Energy, Washington, DC; Environmental Protection Agency, Research Triangle Park, NC, NISTIR 5321, December 1993, 62 p.

• Rothfleisch, P. I.
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  Simple Method of Composition Shifting With a Distillation Column for a Heat Pump Employing a Zeotropic Refrigerant Mixture.
  National Institute of Standards and Technology, Gaithersburg, MD
  Department of Energy, Washington, DC; Environmental Protection Agency, Research Triangle Park, NC, NISTIR 5689, July 1995, 27 p.