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[体]四后卫制；

The Stability Problem in Feedback Systems with Plant Parameter Variations - Synthesis of Feedback Systems - CHAPTER FOUR
A performance comparison of four noise background normalization schemes proposed for signal detection systems
Hybrid write back/write through cache having a streamlined four state cache coherency protocol for uniprocessor computer systems
Generation of radiation by four-wave interaction in a feedback system in the λ=10 µ range
Four-input four-output feedback systems: robust asymptotic behavior
Four-Input Four-Output Feedback Systems: Robust Asymptotic Behaviour
A Liapunov function for four-dimensional positive feedback systems
NONLINEAR OPTICAL EFFECTS AND DEVICES: Generation of radiation by four-wave interaction in a feedback system in the λ=10 µ range
Four-Loop Feedback Control System with Integrator Design for Hypersonic Cruise Missile
A Longitudinal feedback system used under low-energy four bunch operation of the photon factory storage ring