@article{BSMF_1983__111__367_0,
     author = {Cenzer, Douglas and Mauldin, R. Daniel},
     title = {On the {Borel} class of the derived set operator. {II}},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {367--372},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {111},
     year = {1983},
     doi = {10.24033/bsmf.1994},
     mrnumber = {86a:54046},
     zbl = {0552.54027},
     language = {en},
     url = {http://archive.numdam.org/articles/10.24033/bsmf.1994/}
}