TY  - JOUR
AU  - S. Dolecki
AU  - G. H. Greco
TI  - Tangency vis-à-vis Differentiability by Peano, Severi and Guareschi
JO  - Journal of convex analysis
PY  - 2011
SP  - 301
EP  - 339
VL  - 18
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/JCA_2011_18_2_JCA_2011_18_2_a0/
ID  - JCA_2011_18_2_JCA_2011_18_2_a0
ER  -