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Der topologische Abbildungsgrad für vollstetige Vektorfelder zum Nachweis von periodischen Lösungen. (German) Zbl 0182.42102


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[1] Villari, Ann. Mat. pura appl. Ser. 4 69 pp 171– (1965)
[2] Topologische Methoden in der Theorie der nichtlinearen Integralgleichungen, Moskau 1956. · Zbl 0070.33001
[3] und , Qualitative Theorie nichtlinearer Differential-gleichungen, Rom 1963.
[4] Reissig, Deutsch. Akad. Wiss. Berlin 6 pp 407– (1964)
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