Dear Jeff,
Just a couple of quick refs (NOT the earliest, that's from 50s or 60s I think):
Lundberg P (1989) PhD thesis, U of Calgary, Canada.
Lutz NW, Kuesel AC, Hull WE (1993) Magn Reson Med 29:363-368.
Lundberg P, Roy S, Kuchel PW (1994) Immunomethods 4:163-178.
And a few more.
Just my 2 oere.
73, Peter
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