Some applications of Zygmund's lemma to nonlinear differential equations in Banach and Hilbert spaces T. Flett — 1972 Studia Mathematica
Addendum and corrigendum to the paper "Some applications of Zygmund's lemma to non-linear differential equations in Banach and Hilbert spaces" (Studia Math., 44 (1972), pp. 335-344) T. Flett — 1972 Studia Mathematica