@article{MM2_1982__39_154887,
     author = {Wolfgang Sander},
     title = {Boundedness properties for functional inequalities.},
     journal = {Manuscripta mathematica},
     pages = {271--276},
     year = {1982},
     volume = {39},
     zbl = {0493.39006},
     url = {http://geodesic.mathdoc.fr/item/MM2_1982__39_154887/}
}