@article{10_4064_sm_21_1_117_133,
     author = {K. Urbanik},
     title = {Joint probability distributions of observables in quantum mechanics},
     journal = {Studia Mathematica},
     pages = {117--133},
     publisher = {mathdoc},
     volume = {21},
     number = {1},
     year = {1961},
     doi = {10.4064/sm-21-1-117-133},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-21-1-117-133/}
}