[FieldTrip] reference lutkenhoner1992 for eeg_leadfield1

[Lifeng Miao]

Hi fieldtrip group,
When I reading the code of "eeg_leadfield1", I see that there is a reference
called lutkenhoner1992.
But I check all the papers of lutkenhoner, and there is no one related to
the "eeg_leadfield1" code (these is no equation A.17 in these papers).
So could you please show me what is reference for "lutkenhoner1992"?  Thank
you very much!

Thanks,
Lifeng
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