Geodesic
Quasi-Differentiable Norms
Canadian mathematical bulletin, Tome 17 (1974) no. 3, pp. 407-408

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Let E be a real Banach space with norm ρ. Let S={x ∊ E: ρ(x) = 1}. A norm on E is admissible if it generates the same topology as ρ.The normρ is Gateaux differ-entiable if for each x ∊ S and u ∊ E exists. 
Whitfield, J. H. M. Quasi-Differentiable Norms. Canadian mathematical bulletin, Tome 17 (1974) no. 3, pp. 407-408. doi: 10.4153/CMB-1974-075-4
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     title = {Quasi-Differentiable {Norms}},
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     doi = {10.4153/CMB-1974-075-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1974-075-4/}
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