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What Is First Published Reference to XYZ?

In the latest Bridge Bulletin, Boehm writes "It seems to have first appeared in print in the early 90s."  Can anyone point to a reference that early?

Almost certainly, there must be something before Fred Hamilton's chapter in Hardy's 2002 book, Advanced Bridge Bidding for the 21st Century (I recall discussion of it with friends around the time frame Boehm suggests), but Hardy's book is the earliest I've actually seen.

Thanks!

Edit:  I'm looking specifically for the extension of the 2-way checkback principle to 1M rebids and the naming of that as XYZ.

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