I have no idea if the paper is down-loadable (I would suspect not),
however I believe the folowing is the reference to the relevant paper:
"Inductance Calculations in a Complex Integrated Circuit Environment"
A.E. Ruehli, IBM Journal of Research Development, Sept. 1972
This is the paper where Ruehli describes the concepts of partial
inductance, partial mutual inductance, etc. and develops the concept
of a partial element equivalent circuit (though I'm not sure he ever
uses those words in the paper).
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