@article{10_4064_sm_39_3_307_327,
     author = {Kazimierz Napi\'orkowski},
     title = {Continuous tensor products of {Hilbert} spaces and product operators},
     journal = {Studia Mathematica},
     pages = {307--327},
     publisher = {mathdoc},
     volume = {39},
     number = {3},
     year = {1971},
     doi = {10.4064/sm-39-3-307-327},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-39-3-307-327/}
}