@article{urn:eudml:doc:43528, title = {A spherical representation of the real directional derivative.}, journal = {Gaceta Matem\'atica}, volume = {28}, year = {1976}, pages = {25-29}, language = {en}, url = {http://dml.mathdoc.fr/item/urn:eudml:doc:43528} }
González, M. O. A spherical representation of the real directional derivative.. Gaceta Matemática, Tome 28 (1976) pp. 25-29. http://gdmltest.u-ga.fr/item/urn:eudml:doc:43528/