1. Stability by Liapounov's Direct Method with Applications;La Salle,1961
2. Ordinary Differential Equations;Birkhoff,1962
3. Dynamics of Structures;Hurty,1964
4. Foundations of Optimal Control Theory;Lee,1967
5. Nonharmonic Fourier series in the control theory of distributed Parameter systems;Russell;J. Math. Anal. Appl.,1967