Frank Norman writes
> Apologies if you've already seen this.
I had not, and that certainly is a useful piece of information,
thanks for drawing our attention to this.
There is a related development that I am involved in at
http://vole.lanl.gov/ups/ups.htm
If anybody wishes to know more about it please get in touch with
me.
Thomas Krichel http://gretel.econ.surrey.ac.uk
RePEc:per:1965-06-05:thomas_krichel
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