Issue No.04 - April (1972 vol.21)
Melvin A. Breuer , Department of Electrical Engineering, University of Southern California, Los Angeles, Calif. 90007.
In this note we discuss a few attributes and pitfalls of three-valued (0, 1, u) digital logic simulation. The areas covered include hazard and race detection, fault detection, verifying the reset logic of a machine, and the problems encountered with self-timing circuits and in employing a complement for u.
Melvin A. Breuer, "A Note on Three-Valued Logic Simulation", IEEE Transactions on Computers, vol.21, no. 4, pp. 399-402, April 1972, doi:10.1109/TC.1972.5008985