@article{AM2_1992__43_1_137466,
     author = {Horst Alzer and Bert Jagers},
     title = {A functional inequality for real-analytic functions.},
     journal = {Aequationes mathematicae},
     pages = {225--235},
     year = {1992},
     volume = {43},
     number = {1},
     zbl = {0755.39010},
     url = {http://geodesic.mathdoc.fr/item/AM2_1992__43_1_137466/}
}