1. Nonlinear control systems with random inputs;Booton;IRE Trans., Circuit Theory CT-1,1954
2. An approximate method for the statistical investigation for nonlinear systems;Kazakov,1954
3. Response of a nonlinear string to random loading;Caughey;J. Appl. Mech.,1959
4. Response of Van del Pol's Oscillator to Random Excitations;Caughey;J. Appl. Mech.,1959
5. Equivalent linearization techniques;Caughey;J. Acoust. Soc. Am.,1963