@article{10_4064_sm_20_1_1_18,
     author = {R. Bittner},
     title = {Operational calculus in linear spaces},
     journal = {Studia Mathematica},
     pages = {1--18},
     publisher = {mathdoc},
     volume = {20},
     number = {1},
     year = {1961},
     doi = {10.4064/sm-20-1-1-18},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-20-1-1-18/}
}