@article{10_4064_sm_46_1_79_82,
     author = {Kazimierz Napi\'orkowski},
     title = {On generalized eigenfunctions of operators in a {Hilbert} space},
     journal = {Studia Mathematica},
     pages = {79--82},
     publisher = {mathdoc},
     volume = {46},
     number = {1},
     year = {1973},
     doi = {10.4064/sm-46-1-79-82},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-46-1-79-82/}
}