I can't remember where I originally saw it. Hopefully another commented can assist, but it's at least discussed in chapter eight of this report https://govinfo.

I can't remember where I originally saw it. Hopefully another commented can assist, but it's at least discussed in chapter eight of this report https://govinfo.library.unt.edu/ota/Ota_4/DATA/1982/8214.PDF https://govinfo.library.unt.edu/ota/Ota_4/DATA/1982/8214.PDF