1. A non-linear discrete system equivalence of integral pulse frequency modulation systems;Jury;IEEE Trans,1967
2. The stability of pulse frequency modulated closed loop control systems;Clark;IEEE Int. Conv. Rec.,1966
3. Analysis of a new class of pulse-frequency modulated feedback systems;Pavlidis;IEEE Trans,1965
4. Dynamics of non-linear sampled data control systems with pulse-frequency modulation;Chekhovoi,1966
5. Non-linear control systems with pulse-frequency and pulse-width modulation;Kuntsevich,1970