@article{10_4064_fm_115_2_97_105,
     author = {John Burgess},
     title = {Classical hierarchies from a modern standpoint. {Part} {II.} {R-sets}},
     journal = {Fundamenta Mathematicae},
     pages = {97--105},
     publisher = {mathdoc},
     volume = {115},
     number = {2},
     year = {1983},
     doi = {10.4064/fm-115-2-97-105},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-115-2-97-105/}
}