1. Thermodynamics in finite time;Andresen;Phys. Today,1984
2. Gas Heat Pumps: Efficient heating and Cooling With Natural Gas;Bakker,2010
3. Development of a gas fired Vuilleumier heat pump for residential heating//Proceedings of the 24th Intersociety Energy Conversion Engineering Conference;Carlsen,1989
4. Development of a new 20kW gas fired heat pump based on the Vuilleumier cycle;Carlsen,1990
5. A liquid-nitrogen-operated refrigerator for temperatures below 77K;Chellis;Adv. Cryog. Eng.,1964