@article{RSMUP_1971__46__191_0,
     author = {Zaidman, S.},
     title = {On a certain approximation property for first-order abstract differential equations},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {191--198},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {46},
     year = {1971},
     mrnumber = {306976},
     zbl = {0277.34065},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_1971__46__191_0/}
}