I am looking for suggestions of good papers discussing the methods currently
or formerly used to isolate by cryogenic means the CO2 from other gases prior 
to CSIRMS.  I do have a number of articles containing material on the 
subject (mainly "we did it like this" descriptions), but rare are those which 
address the problem from a theoretical or experimental point of view.  This
may be old or even trivially accepted stuff, but I guess there should be
someone somewhere who has once stated the problem right.

Thank you!

Daniel Michaud
Departement de physique
Universite Laval
Quebec, Quebec
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