1. On the stability of an unsymmetrical rigid rotor supported in unsymmetrical bearings;Gladwell;J. Sound Vib.,1966
2. Asymptotic Behaviour and Stability Problems in Ordinary Differential Equations;Cesari,1959
3. Ordinary Differential Equations;Ince,1927
4. RIAS Tech. Rep. 59-6;Hale;On the characteristic exponents of linear periodic differential systems,1959
5. Two numerical methods for the stability of equations with periodic coefficients;Gladwell,1966