@article{MZ_1986__193_173770,
     author = {Yves Dupain},
     title = {Gradients des fonctions int\'erieures dans la boule unit\'e de ...n.},
     journal = {Mathematische Zeitschrift},
     pages = {85--94},
     publisher = {mathdoc},
     volume = {193},
     year = {1986},
     zbl = {0583.32013},
     url = {http://geodesic.mathdoc.fr/item/MZ_1986__193_173770/}
}