1. Fiedler, A., Gerban, J. and Haefner, H.U., “Efficient Single Stage Gifford-MacMahon Refrigerator Operating at 20 K”, in: Advances in Cryogenic Engineering, Vol. 43B, Plenum Press, New York (1997), pp.1823–1830.
2. Wang, C., Wu, P.E. and Chen, Z.Q. “Numerical Modelling of an Orifice Pulse Tube Refrigerator”, Cryogenics, vol.32, no.9 (1992), pp.785–790.