B. Ross Barmish, Christopher V. Hollot, Frank J. Kraus, and Roberto Tempo, "Extreme point results for robust stabilization of interval plants with first order compensators", IEEE Transactions on Automatic Control, 1992, Vol. 37, No. 6, pp. 707-714.

(See Barmish Tempo 1990). In this paper, it is shown that under a certain condition, a controller stabilizes the system for all possible combinations of parameters from given intervals iff it stabilizes 16 (sometimes even 8) combinations. This result is illustrated by a controller for an experimental oblique wing aircraft.