Differentiable mappings on products with different degrees of differentiability in the two factors
H. Alzaareer, A. Schmeding, Expositiones Mathematicae 33 (2015) 184–222.

Invariant manifolds for analytic dynamical systems over ultrametric fields
H. Glöckner, Expositiones Mathematicae 31 (2013) 116–150.

Differential calculus over general base fields and rings.
W. Bertram, H. Glöckner, K.-H. Neeb, Expositiones Mathematicae 22 (2004) 213–282.