REFERENCES
- AIZERMAN , M. A. , and GANTMACHER , F. R. , 1964 , Absolute Stability of Regulator Systems ( English translation ) ( San Francisco , California Holden-Day ).
- HAHN , W. , 1963 , Theory and Application of Liapunov's Direct Method ( Engel-wood Cliffs , New Jersey Prentice-Hall ).
- HALE , J. K. , 1963 , RIAS Report, TR 63–4 , February .
- KRASOVSKII , N. N. , 1963 , Stability of Motion ( English translation ) ( Stanford , California Stanford University Press ).
- POPOV , V. M. , and HALANY , A. , 1963 , Automn remote Control , 23 , 783 ( Russian original published July 1962 ).
- Communicated by the Author. This work was supported in part by NASA Grant NAS 8-18120 and in part by NSP Grant GK-249.