1. The multi-stage hybrid heat pump;Bergmann,1988
2. Sorption-compression heat pumps;Morawetz;Int J Energy Res,1989
3. Compression/absorption heat pumps;Mucic,1990
4. Absorption compression heat pump using TFE/E181;Kawada,1991
5. Compression/absorption cycle for large heat pumps;Åhlby,1989