@article{GDZPPN002330792, title = {Extrinsic Upper Bounds for ...1.}, journal = {Mathematische Annalen}, volume = {280}, year = {1988}, pages = {389-402}, zbl = {0628.53044}, url = {http://dml.mathdoc.fr/item/GDZPPN002330792} }
Heintze, Ernst. Extrinsic Upper Bounds for ...1.. Mathematische Annalen, Tome 280 (1988) pp. 389-402. http://gdmltest.u-ga.fr/item/GDZPPN002330792/