@article{GDZPPN002229749, title = {Maximum principle for hypersurfaces.}, journal = {Manuscripta mathematica}, volume = {64}, year = {1989}, pages = {55-76}, zbl = {0678.53048}, url = {http://dml.mathdoc.fr/item/GDZPPN002229749} }
Eschenburg, J.-H. Maximum principle for hypersurfaces.. Manuscripta mathematica, Tome 64 (1989) pp. 55-76. http://gdmltest.u-ga.fr/item/GDZPPN002229749/