@article{10_4064_cm_51_1_9_25,
     author = {B. Aniszczyk and J. Burzyk and A. Kami\'nski},
     title = {Borel and monotone hierarchies and extension of {R\'enyi} probability spaces},
     journal = {Colloquium Mathematicum},
     pages = {9--25},
     publisher = {mathdoc},
     volume = {51},
     number = {1},
     year = {1987},
     doi = {10.4064/cm-51-1-9-25},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-51-1-9-25/}
}