1. ter Brake, H.J., et al., “Construction and Test of a High-T, SQUID-based Heart Scanner Cooled by Small Stirling Cryocoolers,” ICEC-17, Institute of Physics Publishing (1998), pp. 341–344.
2. van den Bosch, P.J., et al., “Cryogenic Design of a High-T, SQUID-based Heart Scanner Cooled by Small Stirling Cryocoolers,” Cryogenics, vol.37, no.3 (1997), pp.139–151.
3. Chen, G.B., et al., “Study on Two-component Gas Mixture in Regenerative Refrigerators,” ICEC-17, Institute of Physics Publishing (1998), pp. 197–200.
4. Chen, G.B., Gan, Z.H., Thummes, G., and Heiden, C., “Thermodynamic Performance Prediction of Pulse Tube Refrigerators with Mixture Fluids,” to be published in Cryogenics (2000).
5. Gan, Z.H., Chen, G.B., Thummes, G. and Heiden, C., “Experimental Study on Pulse Tube Refrigerator with Helium-nitrogen Gas Mixture,” Cryocoolers 11, Kluwer Academic/Plenum Publishers, New York (2001).