@article{AM2_1990__39_2-3_137352,
     author = {Lutz G. Lucht},
     title = {Mittelwertungleichungen f\"ur {L\"osungen} gewisser {Differenzgleichungen.}},
     journal = {Aequationes mathematicae},
     pages = {204--209},
     publisher = {mathdoc},
     volume = {39},
     number = {2-3},
     year = {1990},
     zbl = {0705.39002},
     url = {http://geodesic.mathdoc.fr/item/AM2_1990__39_2-3_137352/}
}