1. A. Alexeev, H. Quack, Refrigerant mixture for a mixture-throttling process, U.S. Pat., 6513338 (2003).
2. D. J. Missimer, Self-balancing low temperature refrigeration system, U.S. Pat., 3768273 (1973).
3. D. H. Coers, J. W. Sudduth, Refrigerant apparatus and process using multicomponent refrigerant, U.S. Pat., 3932154 (1976).
4. J. Gaumer, S. Lee, N. L. Charles, Combined cascade and multicomponents refrigeration system and method, U.S. Pat., 4274849 (1973).
5. Cryogenic Mixed Refrigerant Process;Venkatarathnam,2008