@article{JRAM_1994__457_153671,
     author = {Klaus Steffen and Frank Duzaar},
     title = {Comparison principles for hypersurfaces of prescribed mean curvature.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {71--84},
     publisher = {mathdoc},
     volume = {457},
     year = {1994},
     zbl = {0820.53007},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1994__457_153671/}
}