@article{10_4064_fm_44_2_115_155,
     author = {H. Griffiths},
     title = {Borel sets and countable series of operations},
     journal = {Fundamenta Mathematicae},
     pages = {115--155},
     publisher = {mathdoc},
     volume = {44},
     number = {2},
     year = {1957},
     doi = {10.4064/fm-44-2-115-155},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-44-2-115-155/}
}