1. Hodgett, D. (1976). Efficient drying using heat pumps. ftc Chemical Engineer, 510–512.
2. Jones, P. (1981). Heat & Mass Transfer in a Radio Frequency Dryer. Ph. D. thesis. Loughborough University of Technology.
3. Lawton, J. (1978). Drying: The role of Heat Pumps and Electromagnetic Fields. Physics in Technology 9, 214–220.
4. Marshall, M. (1997).AHybrid ElectroHeat Drying System. Ph. D. thesis, University of Cambridge.
5. Marshall, M. and Metaxas, A. (1995). A Combined Radio Frequency and Heat Pump Drying System. In Proc. Fifth International Microwave and high frequency heating conference, pp. L3.1-L3.4. EUG, University of Cambridge, UK.