An approximation property for abstract differential equations
Rendiconti del Seminario Matematico della Università di Padova, Tome 55 (1976), pp. 45-48. 
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     author = {Malik, M. A.},
     title = {An approximation property for abstract differential equations},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {45--48},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {55},
     year = {1976},
     mrnumber = {508657},
     zbl = {0376.34047},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_1976__55__45_0/}
}
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Malik, M. A. An approximation property for abstract differential equations. Rendiconti del Seminario Matematico della Università di Padova, Tome 55 (1976), pp. 45-48. http://archive.numdam.org/item/RSMUP_1976__55__45_0/

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