The issue is, "floating" can float where it pleases, later. Not
old timey TTL which has its own pullup current, but CMOS for
sure will drift on leakage alone, to "somewhere".
Some logic families you can just hard-tie. Some more latchup
prone ones want a resistor.
This is all pretty old, primitive, basic stuff and unlikely to see
"serious research". More likely you'd find what you're looking
for in application notes or old logic family databooks, from
back when those were actually printed.