Some remarks concerning regularity of solutions for abstract differential equations
Rendiconti del Seminario Matematico della Università di Padova, Tome 62 (1980), pp. 47-64. 
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     title = {Some remarks concerning regularity of solutions for abstract differential equations},
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     pages = {47--64},
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     volume = {62},
     year = {1980},
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     url = {http://archive.numdam.org/item/RSMUP_1980__62__47_0/}
}
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Zaidman, S. Some remarks concerning regularity of solutions for abstract differential equations. Rendiconti del Seminario Matematico della Università di Padova, Tome 62 (1980), pp. 47-64. http://archive.numdam.org/item/RSMUP_1980__62__47_0/

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