@article{10_4064_sm_27_2_141_145,
     author = {J. Mikusi\'nski},
     title = {An approximation theorem and its applications in operational calculus},
     journal = {Studia Mathematica},
     pages = {141--145},
     publisher = {mathdoc},
     volume = {27},
     number = {2},
     year = {1966},
     doi = {10.4064/sm-27-2-141-145},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-27-2-141-145/}
}