@article{10_4064_cm_18_1_181_184,
     author = {J. Kisy\'nski},
     title = {A proof of the {Trotter-Kato} theorem on approximation of semi-groups},
     journal = {Colloquium Mathematicum},
     pages = {181--184},
     publisher = {mathdoc},
     volume = {18},
     number = {1},
     year = {1967},
     doi = {10.4064/cm-18-1-181-184},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-18-1-181-184/}
}