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2. Ordinary Differential Equations;Arnold,1973
3. Dopolnitelnye glavy teorii obyknovennykh differentzialnykh uravneniy;Arnold,1978
4. O periodicheskikh resheniyakh odnoy sistemy differentzialnykh uravneniy;Bautin;PMM,1954
5. Structural and dynamic stability of model predator-prey systems;Bazykin;Int. Inst. Appl. Syst.,1976