@article{10_4064_cm_41_2_187_191,
     author = {R. C. Freiwald and R. McDowell and E. F. McHugh, Jr.},
     title = {Borel sets of exact class},
     journal = {Colloquium Mathematicum},
     pages = {187--191},
     publisher = {mathdoc},
     volume = {41},
     number = {2},
     year = {1979},
     doi = {10.4064/cm-41-2-187-191},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-41-2-187-191/}
}