A.G. Spencer and J. Stenhouse
Alacritas Consultancy Ltd.
Telemark Cryogenics Ltd.

A good Overview of the Water Vapor
Cryo-Pumping Principles as used in
Polycold and Telemark Units.

2002 ASHRAE Refrigeration Handbook
Cascade and AutoCascade Systems

Does a Comparison between AutoCascade
and Traditional Cascade Low-Temperature
Refrigeration Systems, and the Theory
of their Operation.