1. and (1982). ‘Experiments with R133a. A new refrigerant for high temperature heat pumps’, Int. Symp. on the Industrial Application of Heat Pumps, pp. 31–40, Conventry, U.K.
2. and (1979) ‘Influence of speed control on the valve performance and on the efficiency of heat pump reciprocating compressors: Valve behaviour and energy losses at variable speed’, Antriebe fur Wärme Pumpen, pp. 69–74, Essen, West Germany.
3. and (1979). ‘Performance estimation of a total energy domestic heat pump’, IEE Conference on Future Energy Concepts, London, U.K.
4. and (1981). ‘Performance characteristics of variable speed heat pump’, 3rd Int. Conf. on Future Energy Concepts, IEE Conf. Pub. 192, pp. 255–258, London, U.K.
5. , and (1982). ‘Performance of selected synthetic lubricants in industrial heat pumps’, Int. Symp. on the Industrial Application of Heat Pumps, pp. 41–54, Conventry, U.K.