@article{10_4064_ap_10_3_273_278,
     author = {W. Mlak},
     title = {A note on approximation of solutions of abstract differential equations},
     journal = {Annales Polonici Mathematici},
     pages = {273--278},
     publisher = {mathdoc},
     volume = {10},
     number = {3},
     year = {1961},
     doi = {10.4064/ap-10-3-273-278},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-10-3-273-278/}
}