1. Johnson, A.L., Spacecraft-Borne Long Life Cryogenic Refrigeration Status and Trends, in: “Refrigeration for Cryogenic Sensors”, M. Gasser, ed., NASA CP-2287 (1983), p. 47.
2. Sixsmith, H. and Swift, W.L., A Miniature Tilting Pad Gas Lubricated Bearing, “Refrigeration for Cryogenic Sensors”, M. Gasser, ed., NASA CP-2287 (1983), p. 189.
3. Valenzuela, J.A., et al., Long-Life, Closed-Cycle Cryocooler for Space, Creare TN-413, presented at 4th International Cryocooler Conference, Easton MD (1986).