1. The Dynamic Stability of Elastic Systems;Bolotin,1964
2. Aeroelasticity;Bisplinghoff,1955
3. Problème Général de la Stabilitié du Mouvement;Lyapunov,1949
4. Methods of A.M. Lyapunov and Their Applications;Zubov,1957
5. On the Stability of Solutions of Denumerable Systems of Differential Equations;Persidskii;Akademii Nauk Kazakhskio SSSR, Ser. Matem.,1948