Thanks.
I have Litz's book; I have Hatcher's (shall go back and look); McCoy's is on the way.
I e-mailed Litz. He told me that the equation looks like something Pejsa did, so Pejsa's book (FWIW) is also on its way.
Obviously for practical applications I'd go to a program, but nostalgia is driving me to try to find this article (or the "meat" from which it was derived).
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