Abschätzung nach unten für Lösungen nichtlinearer Differentialungleichungen
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 27 (1973) no. 3, pp. 441-456. 
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     author = {Redheffer, Ray},
     title = {Absch\"atzung nach unten f\"ur {L\"osungen} nichtlinearer {Differentialungleichungen}},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {441--456},
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Redheffer, Ray. Abschätzung nach unten für Lösungen nichtlinearer Differentialungleichungen. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 27 (1973) no. 3, pp. 441-456. http://archive.numdam.org/item/ASNSP_1973_3_27_3_441_0/

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