@article{GDZPPN002311291, title = {The Set of Derivatives in a Non-Archimedean Field.}, journal = {Mathematische Annalen}, volume = {217}, year = {1975}, pages = {67-70}, zbl = {0308.12102}, url = {http://dml.mathdoc.fr/item/GDZPPN002311291} }
Schikhof, W.H. The Set of Derivatives in a Non-Archimedean Field.. Mathematische Annalen, Tome 217 (1975) pp. 67-70. http://gdmltest.u-ga.fr/item/GDZPPN002311291/