@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/