1. On the statistical investigation of dynamical systems;Andronov;J. expr. theor. Phys.,1933
2. Problems arising in the analysis of randomly disturbed non-linear control systems;Barrett;Ph.D. Thesis,1958
3. Nonlinear servomechanisms with random inputs;Booton;Rep. 70, DACL, M. I. T.,1953
4. A study of non-linear systems with random inputs;Chuang;Applications and Industry, A. I. E. E.,1959