Existence of almost-periodic ultra-weak solutions to the equation u ' (t)=a(t)Au(t)+f(t) in Hilbert spaces
Rendiconti del Seminario Matematico della Università di Padova, Tome 81 (1989), pp. 201-208. 
@article{RSMUP_1989__81__201_0,
     author = {Zaidman, Samuel},
     title = {Existence of almost-periodic ultra-weak solutions to the equation $u^{\prime }(t) = a(t) Au(t) + f(t)$ in {Hilbert} spaces},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {201--208},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {81},
     year = {1989},
     mrnumber = {1020194},
     zbl = {0679.34041},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_1989__81__201_0/}
}
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Zaidman, Samuel. Existence of almost-periodic ultra-weak solutions to the equation $u^{\prime }(t) = a(t) Au(t) + f(t)$ in Hilbert spaces. Rendiconti del Seminario Matematico della Università di Padova, Tome 81 (1989), pp. 201-208. http://archive.numdam.org/item/RSMUP_1989__81__201_0/

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