@article{MAN_1988__280_3_164370,
     author = {Ernst Heintze},
     title = {Extrinsic {Upper} {Bounds} for ...1.},
     journal = {Mathematische Annalen},
     pages = {389--402},
     publisher = {mathdoc},
     volume = {280},
     number = {3},
     year = {1988},
     zbl = {0628.53044},
     url = {http://geodesic.mathdoc.fr/item/MAN_1988__280_3_164370/}
}