@article{ASNSP_1973_3_27_3_441_0,
     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},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 27},
     number = {3},
     year = {1973},
     zbl = {0302.35024},
     language = {de},
     url = {http://archive.numdam.org/item/ASNSP_1973_3_27_3_441_0/}
}