1. Stability of Motion;Chetayev,1965
2. On the question of gyroscopic stabilization;Metelitsyn;Dokl. Akad. Nauk SSSR,1952
3. Linear elastic stability;Ziegler;ZAMP,1953
4. On the stability of linear discrete dynamic systems;Walker;Trans. ASME, Ser. E, Appl. Mech.,1970
5. Zur Stabilität nichtkonservativer lineare Systeme;Frik;ZAMM,1972