REFERENCES
- AIZERMAK , M. A. , and GANTMAOHEK , F. R. , 1964 , Absolute Stability of Regulator Systems ( Holden-Day, Inc. )
- KAMAN , R..E. , 1963 , Proc. natn. Acad. Sci. U.S.A. , 49 , 201 .
- † Communicated by the Authors. This work was supported in part by NASA Grant NAS8-18120 and in part by NSF Grant GK-249.